Question 173791
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