Equivalent Expressions Question 1

Which of the following expressions is equivalent to $-4x^3-12x^3+9x^2$ ?

x^8

-7x^8

-8x^3+9x^2

-16x^3+9x^2

-16x^6+9x^2

Approach

-4x^3-12x^3+9x^2

We can only combine the cubic term here:

(-4-12)x^3+9x^2

= \boxed{-16x^3+9x^2}