Question

Simplify the expression (5r - 7)(9r^2-4r-8)

Answer 1

For this problem, you will need to foil. Multiply each term in the first expression (5r-7) by each term in the second expression (9r^2-4r-8)

When we foil, we get:

$45r^3-20r^2-40r-63r^2+28r+56$

Combine like terms:

$45r^3-83r^2-12r+56$

This is your final answer since you can do nothing further to simplify.