SOLUTION: how would i do this? Factor the following polynomial completely. y2 + 12y + 36=

Question 146261: how would i do this?
Factor the following polynomial completely.
y2 + 12y + 36=

Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!

Looking at we can see that the first term is and the last term is where the coefficients are 1 and 36 respectively.

Now multiply the first coefficient 1 and the last coefficient 36 to get 36. Now what two numbers multiply to 36 and add to the middle coefficient 12? Let's list all of the factors of 36:

Factors of 36:
1,2,3,4,6,9,12,18

-1,-2,-3,-4,-6,-9,-12,-18 ...List the negative factors as well. This will allow us to find all possible combinations

These factors pair up and multiply to 36
1*36
2*18
3*12
4*9
6*6
(-1)*(-36)
(-2)*(-18)
(-3)*(-12)
(-4)*(-9)
(-6)*(-6)

note: remember two negative numbers multiplied together make a positive number

Now which of these pairs add to 12? Lets make a table of all of the pairs of factors we multiplied and see which two numbers add to 12

First Number	Second Number	Sum
1	36	1+36=37
2	18	2+18=20
3	12	3+12=15
4	9	4+9=13
6	6	6+6=12
-1	-36	-1+(-36)=-37
-2	-18	-2+(-18)=-20
-3	-12	-3+(-12)=-15
-4	-9	-4+(-9)=-13
-6	-6	-6+(-6)=-12

From this list we can see that 6 and 6 add up to 12 and multiply to 36

Now looking at the expression , replace with (notice adds up to . So it is equivalent to )

Now let's factor by grouping:

Group like terms

Factor out the GCF of out of the first group. Factor out the GCF of out of the second group

Since we have a common term of , we can combine like terms

So factors to

So this also means that factors to (since is equivalent to )

note: is equivalent to since the term occurs twice. So also factors to

------------------------------------------------------------

Answer:
So factors to

RELATED QUESTIONS
how would i do this? Factor the following polynomial completely. 96x2 - 6y2 = (answered by jim_thompson5910)

200x2 - 50 How would I factor this polynomial... (answered by ankor@dixie-net.com)

This is what my teacher gave me for homework i got question one but i had to ask. She... (answered by checkley77)

I need to factor the polynomial completely: 14x^2+24x+10 How do I do... (answered by vertciel)

how do i factor this completely?... (answered by stanbon,chitra)

Factor completely. If the polynomial cannot be factored, enter PRIME 27x^2-36xy+12y^2 (answered by jim_thompson5910)

Factor this polynomial completely:... (answered by scott8148)

Hello, I need some healp. How would you factor this completely?... (answered by stanbon)

Factor the polynomial completely: x^2y-36y+6x^2-216 I factor this out to... (answered by mananth)