Question

find the product. simplify your answer.
$r^{2}(-r^{2}-9)$

Explanation:

Step1: Distribute $r^2$ to each term

$r^2(-r^2) + r^2(-9)$

Step2: Simplify each product

$-r^{2+2} - 9r^2 = -r^4 - 9r^2$

Answer:

$-r^4 - 9r^2$