SOLUTION: help me solve this problem please. 4a^2-2[3b-5b(b+4)]

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Question 173791: help me solve this problem please.
4a^2-2[3b-5b(b+4)]
Answer by KnightOwlTutor(293) About Me  (Show Source):
You can put this solution on YOUR website!
4a^2-2[3b-5b(b+4)]
the first step is to expand this -5b(b+4)=-5b^2-20b

4a^2-2[3b-5b^2-20b]
-2[3b-5b^2-20b]=-6b+10b^2+40b
4a^2-6b+10b^2+40b
Combine like terms and simplify
4a^2+34b+10b^2