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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#

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