How do you multiply -4b(1-9b-2b^2)?

1 Answer
May 11, 2018

8b^3 + 36b^2 - 4b

Explanation:

Just Distribute -4b and multiply with each term.
-4b(1-9b-2b^2) = (-4b)(1) - (-4b)(9b) - (-4b)(2b^2)

Watch out for Sign Changes, if any.
= -4b + 36b^2 + 8b^3

Re-order from highest power to lowest:
= 8b^3 + 36b^2 - 4b