Question

what is f(–3) for the function f(a) = –2a2 – 5a 4

Answer 1

f(a) = -2a^2 - 5a^4
if a=-3

f(-3) = -2(-3)^2 - 5(-3)^4
        = (-2*9) - (5*81)
        = -18 - 405
        = 423