Question

Factor completely

x^3 +2x^2 -15x

Answer 1

What do you not understand about this problem? I will talk you through it.

Answer 2

I just forgot how to factor

Answer 3

first, factor out the GCF (greatest common factor)

Answer 4

I was just typing that, but what Zale said ^

Answer 5

x^3 +2x^2 -15x
the greatest common factor is x so factor that out

Answer 6

X(x^2)+(2x)-15

Answer 7

5 and 3 will play a part here :)

Answer 8

That was as far as I have gotten....

Answer 9

Well i kinda cheat. If you have a calculator or solve it graphically usually you can get the roots

0,3 and -5 so now you are able to get it in the form of

(x-a), (x-b), (x-c) where a b and c are 0, 3 and -5

Answer 10

even on al old ti84 you can find the roots aka zeros, which are 0, 3 and -5. You can do so using the graphing feature and knowing that a 3rd degree polynomial may have max of 3 roots.

Answer 11

X(x-3)(x+5) would that be it

Answer 12

Yes :D

Answer 13

Hooray

Answer 14

YAY thanks for medal ^_^