Question

11. Simplify:
(a) a(a+4)+3a(2a^2 -1)+4a^2+4 at a=-2
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Answer 1

a(a+4)+3a(2a^2 -1)+4a^2+4 at a=-2

-2(-2+4)+3(-2)(2(-2)^2-1)+5(-2)^2+4

-2(2)-6(8-1)+5(4)+4

-4-56+20+4

-36