What is the value of the expression when a = –4 and b = 5? (a+2b)3 + 3a 2 A. –348 B. 264 C. –952 D. 168 Please Help me ASAP

asked Apr 5, 2017 59.8k views

1 vote

What is the value of the expression when a = –4 and b = 5?

(a+2b)3 + 3a 2
A.
–348

B.
264

C.
–952

D.
168
Please Help me ASAP

by Chi

7.7k points

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5 votes

$(a+2b)^3 + 3a^2\\\\=(-4+2(5))^3 + 3(-4)^2\\\\=(-4+10)^3 +3(16)\\\\=6^3 + 3(16)\\\\=216 + 48\\\\=\boxed{\bf{264}}$

Your answer is B) 264.

Jbjstam answered Apr 10, 2017

7.0k points

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