Method to factor an expression
$begingroup$
As the title says, i want to factorize an expression, but i don't have any clue how to proceed.
Here is the expression :
$2x² -7x +3$
And here is the factorized form :
$(x-3)(2x - 1)$
My question is, which method or rule to use to go from first to second ?
please note that I am a beginner, and the only question that i found which is closer to mine is this post.
Thank you for your help !
factoring
$endgroup$
add a comment |
$begingroup$
As the title says, i want to factorize an expression, but i don't have any clue how to proceed.
Here is the expression :
$2x² -7x +3$
And here is the factorized form :
$(x-3)(2x - 1)$
My question is, which method or rule to use to go from first to second ?
please note that I am a beginner, and the only question that i found which is closer to mine is this post.
Thank you for your help !
factoring
$endgroup$
add a comment |
$begingroup$
As the title says, i want to factorize an expression, but i don't have any clue how to proceed.
Here is the expression :
$2x² -7x +3$
And here is the factorized form :
$(x-3)(2x - 1)$
My question is, which method or rule to use to go from first to second ?
please note that I am a beginner, and the only question that i found which is closer to mine is this post.
Thank you for your help !
factoring
$endgroup$
As the title says, i want to factorize an expression, but i don't have any clue how to proceed.
Here is the expression :
$2x² -7x +3$
And here is the factorized form :
$(x-3)(2x - 1)$
My question is, which method or rule to use to go from first to second ?
please note that I am a beginner, and the only question that i found which is closer to mine is this post.
Thank you for your help !
factoring
factoring
asked Dec 18 '18 at 9:18
ganzo dbganzo db
155
155
add a comment |
add a comment |
4 Answers
4
active
oldest
votes
$begingroup$
Rewrite the expression into the form:
$2x^2-6x-x+3$ ,
then group the first two terms together and the last two terms together:
$(2x^2-6x)-(x-3)=2x(x-3)-(x-3)$ ,
next extract the common factor:
$(x-3)(2x-1)$ ,
and you are done.
$endgroup$
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
add a comment |
$begingroup$
If it concerns quadratic polynomial $ax^2+bx+c$ then start with calculating discriminant: $$D:=b^2-4ac$$
If $D$ is negative then give up (unless you are familiar with complex numbers already).
If $D$ is nonnegative then: $$ax^2+bx+c=a(x-x_1)(x-x_2)$$ where $x_1=frac{-b+sqrt D}{2a}$ and $x_2=frac{-b-sqrt D}{2a}$.
Especially if $D$ is a perfect square (as in your case, where $D=25$) then there is reason to cheer.
$endgroup$
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
add a comment |
$begingroup$
It relies on the following property of quadratic polynomials:
If the quadratic polynomial $;ax^2+bx+c;(ane 0)$ has roots $xi_0$ and $xi_1$ (real or complex, distinct ot not), it can factored as
$$ax^2+bx+c=a(x-xi_0)(x-xi_1).$$
This property is a consequence of a more general property of polynomials (of any degree) and the ring of polynomials over a field being a euclidean domain:
If a polynomial $p(x)$ has root $xi$, it is divisible by $x-xi$.
In the present case, the discriminat of $2x² -7x +3$ is $;Delta=49-4cdot 2cdot 3=25$, so its roots are $;frac{7pm 5}4==bigl{3,frac 12bigr}$, and the factorisation is
$$2(x-3)Bigl(x-frac12Bigr)=(x-3)(2x-1).$$
$endgroup$
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
add a comment |
$begingroup$
In general ,if $x_1$ and $x_2$ are roots of $$underbrace{a}_{neq 0}x^2+bx+c=0$$ then $$ax^2+bx+c=k(x-x_1)(x-x_2)=k[x^2-(x_1+x_2)x+x_1x_2]$$ comparing the coefficients, $$a=k,b=-k(x_1+x_2),c=kx_1x_2$$ Consequently $$text{sum of the roots}=-frac{b}{a};;&;;text{product of the roots}=frac{c}{a}$$
So your case, $x_1+x_2= frac{7}{2}$ and $x_1x_2=frac{3}{2}$
Now solve these to get $x_1$ and $x_2$ to finish your conclusion
To find $x_1$ and $x_2$, $$2x^2-7x+3=0$$ implies $$x^2-frac{7}{2}x+frac{3}{2}=0$$ which means $$x^2-2left(frac{7}{4}right)x=-frac{3}{2}$$ which is same as $$x^2-2left(frac{7}{4}right)x+frac{49}{16}=-frac{3}{2}+frac{49}{16}=frac{25}{16}$$ so $$left(x-frac{7}{4}right)^2=frac{25}{16}$$ and so $$x-frac{7}{4}=pm sqrt{frac{25}{16}}=pm frac{5}{4}$$ so $$x=frac{7}{4} pm frac{5}{4}=frac{7pm 5}{4}$$
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$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Rewrite the expression into the form:
$2x^2-6x-x+3$ ,
then group the first two terms together and the last two terms together:
$(2x^2-6x)-(x-3)=2x(x-3)-(x-3)$ ,
next extract the common factor:
$(x-3)(2x-1)$ ,
and you are done.
$endgroup$
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
add a comment |
$begingroup$
Rewrite the expression into the form:
$2x^2-6x-x+3$ ,
then group the first two terms together and the last two terms together:
$(2x^2-6x)-(x-3)=2x(x-3)-(x-3)$ ,
next extract the common factor:
$(x-3)(2x-1)$ ,
and you are done.
$endgroup$
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
add a comment |
$begingroup$
Rewrite the expression into the form:
$2x^2-6x-x+3$ ,
then group the first two terms together and the last two terms together:
$(2x^2-6x)-(x-3)=2x(x-3)-(x-3)$ ,
next extract the common factor:
$(x-3)(2x-1)$ ,
and you are done.
$endgroup$
Rewrite the expression into the form:
$2x^2-6x-x+3$ ,
then group the first two terms together and the last two terms together:
$(2x^2-6x)-(x-3)=2x(x-3)-(x-3)$ ,
next extract the common factor:
$(x-3)(2x-1)$ ,
and you are done.
edited Dec 18 '18 at 10:11
answered Dec 18 '18 at 10:05
MatkoMatko
864
864
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
add a comment |
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
I like the simplicity of your method, thank's :)
$endgroup$
– ganzo db
Dec 18 '18 at 16:41
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
$begingroup$
@ganzodb You are welcome
$endgroup$
– Matko
Dec 18 '18 at 18:24
add a comment |
$begingroup$
If it concerns quadratic polynomial $ax^2+bx+c$ then start with calculating discriminant: $$D:=b^2-4ac$$
If $D$ is negative then give up (unless you are familiar with complex numbers already).
If $D$ is nonnegative then: $$ax^2+bx+c=a(x-x_1)(x-x_2)$$ where $x_1=frac{-b+sqrt D}{2a}$ and $x_2=frac{-b-sqrt D}{2a}$.
Especially if $D$ is a perfect square (as in your case, where $D=25$) then there is reason to cheer.
$endgroup$
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
add a comment |
$begingroup$
If it concerns quadratic polynomial $ax^2+bx+c$ then start with calculating discriminant: $$D:=b^2-4ac$$
If $D$ is negative then give up (unless you are familiar with complex numbers already).
If $D$ is nonnegative then: $$ax^2+bx+c=a(x-x_1)(x-x_2)$$ where $x_1=frac{-b+sqrt D}{2a}$ and $x_2=frac{-b-sqrt D}{2a}$.
Especially if $D$ is a perfect square (as in your case, where $D=25$) then there is reason to cheer.
$endgroup$
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
add a comment |
$begingroup$
If it concerns quadratic polynomial $ax^2+bx+c$ then start with calculating discriminant: $$D:=b^2-4ac$$
If $D$ is negative then give up (unless you are familiar with complex numbers already).
If $D$ is nonnegative then: $$ax^2+bx+c=a(x-x_1)(x-x_2)$$ where $x_1=frac{-b+sqrt D}{2a}$ and $x_2=frac{-b-sqrt D}{2a}$.
Especially if $D$ is a perfect square (as in your case, where $D=25$) then there is reason to cheer.
$endgroup$
If it concerns quadratic polynomial $ax^2+bx+c$ then start with calculating discriminant: $$D:=b^2-4ac$$
If $D$ is negative then give up (unless you are familiar with complex numbers already).
If $D$ is nonnegative then: $$ax^2+bx+c=a(x-x_1)(x-x_2)$$ where $x_1=frac{-b+sqrt D}{2a}$ and $x_2=frac{-b-sqrt D}{2a}$.
Especially if $D$ is a perfect square (as in your case, where $D=25$) then there is reason to cheer.
answered Dec 18 '18 at 9:39
drhabdrhab
101k545136
101k545136
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
add a comment |
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
$begingroup$
As you supposed, i'm not good with complex numbers :) !
$endgroup$
– ganzo db
Dec 18 '18 at 16:54
add a comment |
$begingroup$
It relies on the following property of quadratic polynomials:
If the quadratic polynomial $;ax^2+bx+c;(ane 0)$ has roots $xi_0$ and $xi_1$ (real or complex, distinct ot not), it can factored as
$$ax^2+bx+c=a(x-xi_0)(x-xi_1).$$
This property is a consequence of a more general property of polynomials (of any degree) and the ring of polynomials over a field being a euclidean domain:
If a polynomial $p(x)$ has root $xi$, it is divisible by $x-xi$.
In the present case, the discriminat of $2x² -7x +3$ is $;Delta=49-4cdot 2cdot 3=25$, so its roots are $;frac{7pm 5}4==bigl{3,frac 12bigr}$, and the factorisation is
$$2(x-3)Bigl(x-frac12Bigr)=(x-3)(2x-1).$$
$endgroup$
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
add a comment |
$begingroup$
It relies on the following property of quadratic polynomials:
If the quadratic polynomial $;ax^2+bx+c;(ane 0)$ has roots $xi_0$ and $xi_1$ (real or complex, distinct ot not), it can factored as
$$ax^2+bx+c=a(x-xi_0)(x-xi_1).$$
This property is a consequence of a more general property of polynomials (of any degree) and the ring of polynomials over a field being a euclidean domain:
If a polynomial $p(x)$ has root $xi$, it is divisible by $x-xi$.
In the present case, the discriminat of $2x² -7x +3$ is $;Delta=49-4cdot 2cdot 3=25$, so its roots are $;frac{7pm 5}4==bigl{3,frac 12bigr}$, and the factorisation is
$$2(x-3)Bigl(x-frac12Bigr)=(x-3)(2x-1).$$
$endgroup$
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
add a comment |
$begingroup$
It relies on the following property of quadratic polynomials:
If the quadratic polynomial $;ax^2+bx+c;(ane 0)$ has roots $xi_0$ and $xi_1$ (real or complex, distinct ot not), it can factored as
$$ax^2+bx+c=a(x-xi_0)(x-xi_1).$$
This property is a consequence of a more general property of polynomials (of any degree) and the ring of polynomials over a field being a euclidean domain:
If a polynomial $p(x)$ has root $xi$, it is divisible by $x-xi$.
In the present case, the discriminat of $2x² -7x +3$ is $;Delta=49-4cdot 2cdot 3=25$, so its roots are $;frac{7pm 5}4==bigl{3,frac 12bigr}$, and the factorisation is
$$2(x-3)Bigl(x-frac12Bigr)=(x-3)(2x-1).$$
$endgroup$
It relies on the following property of quadratic polynomials:
If the quadratic polynomial $;ax^2+bx+c;(ane 0)$ has roots $xi_0$ and $xi_1$ (real or complex, distinct ot not), it can factored as
$$ax^2+bx+c=a(x-xi_0)(x-xi_1).$$
This property is a consequence of a more general property of polynomials (of any degree) and the ring of polynomials over a field being a euclidean domain:
If a polynomial $p(x)$ has root $xi$, it is divisible by $x-xi$.
In the present case, the discriminat of $2x² -7x +3$ is $;Delta=49-4cdot 2cdot 3=25$, so its roots are $;frac{7pm 5}4==bigl{3,frac 12bigr}$, and the factorisation is
$$2(x-3)Bigl(x-frac12Bigr)=(x-3)(2x-1).$$
answered Dec 18 '18 at 9:40
BernardBernard
121k740116
121k740116
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
add a comment |
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
$begingroup$
i wish i could understand the last one ( frac{7pm 5}4 ).
$endgroup$
– ganzo db
Dec 18 '18 at 16:57
2
2
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
$begingroup$
@ganzodb: It's just the formula $frac{-bpmsqrtDelta}{2a}.$.
$endgroup$
– Bernard
Dec 18 '18 at 18:22
add a comment |
$begingroup$
In general ,if $x_1$ and $x_2$ are roots of $$underbrace{a}_{neq 0}x^2+bx+c=0$$ then $$ax^2+bx+c=k(x-x_1)(x-x_2)=k[x^2-(x_1+x_2)x+x_1x_2]$$ comparing the coefficients, $$a=k,b=-k(x_1+x_2),c=kx_1x_2$$ Consequently $$text{sum of the roots}=-frac{b}{a};;&;;text{product of the roots}=frac{c}{a}$$
So your case, $x_1+x_2= frac{7}{2}$ and $x_1x_2=frac{3}{2}$
Now solve these to get $x_1$ and $x_2$ to finish your conclusion
To find $x_1$ and $x_2$, $$2x^2-7x+3=0$$ implies $$x^2-frac{7}{2}x+frac{3}{2}=0$$ which means $$x^2-2left(frac{7}{4}right)x=-frac{3}{2}$$ which is same as $$x^2-2left(frac{7}{4}right)x+frac{49}{16}=-frac{3}{2}+frac{49}{16}=frac{25}{16}$$ so $$left(x-frac{7}{4}right)^2=frac{25}{16}$$ and so $$x-frac{7}{4}=pm sqrt{frac{25}{16}}=pm frac{5}{4}$$ so $$x=frac{7}{4} pm frac{5}{4}=frac{7pm 5}{4}$$
$endgroup$
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
add a comment |
$begingroup$
In general ,if $x_1$ and $x_2$ are roots of $$underbrace{a}_{neq 0}x^2+bx+c=0$$ then $$ax^2+bx+c=k(x-x_1)(x-x_2)=k[x^2-(x_1+x_2)x+x_1x_2]$$ comparing the coefficients, $$a=k,b=-k(x_1+x_2),c=kx_1x_2$$ Consequently $$text{sum of the roots}=-frac{b}{a};;&;;text{product of the roots}=frac{c}{a}$$
So your case, $x_1+x_2= frac{7}{2}$ and $x_1x_2=frac{3}{2}$
Now solve these to get $x_1$ and $x_2$ to finish your conclusion
To find $x_1$ and $x_2$, $$2x^2-7x+3=0$$ implies $$x^2-frac{7}{2}x+frac{3}{2}=0$$ which means $$x^2-2left(frac{7}{4}right)x=-frac{3}{2}$$ which is same as $$x^2-2left(frac{7}{4}right)x+frac{49}{16}=-frac{3}{2}+frac{49}{16}=frac{25}{16}$$ so $$left(x-frac{7}{4}right)^2=frac{25}{16}$$ and so $$x-frac{7}{4}=pm sqrt{frac{25}{16}}=pm frac{5}{4}$$ so $$x=frac{7}{4} pm frac{5}{4}=frac{7pm 5}{4}$$
$endgroup$
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
add a comment |
$begingroup$
In general ,if $x_1$ and $x_2$ are roots of $$underbrace{a}_{neq 0}x^2+bx+c=0$$ then $$ax^2+bx+c=k(x-x_1)(x-x_2)=k[x^2-(x_1+x_2)x+x_1x_2]$$ comparing the coefficients, $$a=k,b=-k(x_1+x_2),c=kx_1x_2$$ Consequently $$text{sum of the roots}=-frac{b}{a};;&;;text{product of the roots}=frac{c}{a}$$
So your case, $x_1+x_2= frac{7}{2}$ and $x_1x_2=frac{3}{2}$
Now solve these to get $x_1$ and $x_2$ to finish your conclusion
To find $x_1$ and $x_2$, $$2x^2-7x+3=0$$ implies $$x^2-frac{7}{2}x+frac{3}{2}=0$$ which means $$x^2-2left(frac{7}{4}right)x=-frac{3}{2}$$ which is same as $$x^2-2left(frac{7}{4}right)x+frac{49}{16}=-frac{3}{2}+frac{49}{16}=frac{25}{16}$$ so $$left(x-frac{7}{4}right)^2=frac{25}{16}$$ and so $$x-frac{7}{4}=pm sqrt{frac{25}{16}}=pm frac{5}{4}$$ so $$x=frac{7}{4} pm frac{5}{4}=frac{7pm 5}{4}$$
$endgroup$
In general ,if $x_1$ and $x_2$ are roots of $$underbrace{a}_{neq 0}x^2+bx+c=0$$ then $$ax^2+bx+c=k(x-x_1)(x-x_2)=k[x^2-(x_1+x_2)x+x_1x_2]$$ comparing the coefficients, $$a=k,b=-k(x_1+x_2),c=kx_1x_2$$ Consequently $$text{sum of the roots}=-frac{b}{a};;&;;text{product of the roots}=frac{c}{a}$$
So your case, $x_1+x_2= frac{7}{2}$ and $x_1x_2=frac{3}{2}$
Now solve these to get $x_1$ and $x_2$ to finish your conclusion
To find $x_1$ and $x_2$, $$2x^2-7x+3=0$$ implies $$x^2-frac{7}{2}x+frac{3}{2}=0$$ which means $$x^2-2left(frac{7}{4}right)x=-frac{3}{2}$$ which is same as $$x^2-2left(frac{7}{4}right)x+frac{49}{16}=-frac{3}{2}+frac{49}{16}=frac{25}{16}$$ so $$left(x-frac{7}{4}right)^2=frac{25}{16}$$ and so $$x-frac{7}{4}=pm sqrt{frac{25}{16}}=pm frac{5}{4}$$ so $$x=frac{7}{4} pm frac{5}{4}=frac{7pm 5}{4}$$
edited Dec 18 '18 at 10:17
answered Dec 18 '18 at 10:04
Chinnapparaj RChinnapparaj R
5,4872928
5,4872928
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
add a comment |
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
$begingroup$
Thank you for the time spent in the explanation, i'm still unfamiliar with some mathematical concepts.
$endgroup$
– ganzo db
Dec 18 '18 at 16:53
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