Question

-Factor Out The GCF Of The Polynomial
x^3-4x^2-21x

Answer 1

Is there anything besides x that you can factor out?

Answer 2

What is left is easy to factor. Do the first step by factoring x out.

Answer 3

I will do the first step for you.
\[x^3-4x^2-21x =x( x^2-4x-21)\]

Answer 4

\[
x^2 - 4 x - 21= (x -?)( x+?)

\]

Answer 5

So How Do You Factor Out The Rest?

Answer 6

(x-7)(x+3)

Answer 7

Can You Exsplain How You Got It?

Answer 8

x1+x2=-(-4)
x1.x2=-21

Answer 9

sum 4 and product 21

Answer 10

(x -7)(x + 3) = x·x -x·7 + 3·x +-21
First Outer Inner Last

= x^2 -4x -21