Answer:
4
Step-by-step explanation:
There is a formula. if f(x) is divided by x -r, the remainder is f(r)
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f(-1) = -14
(-1)^4 + a (-1)^2 - 16 = -14
1 + a - 16 = -14
1 + a = 2
a = 1
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if f(x) = x^4 + ax^2 - 16
and f(x) divided by x - 2
remainder = f(2) = 2^4 + a*2^2 - 16
f(2) = 16 + 4 - 16 = 4
