Question

If f(x) = x3 – 2x2, which expression is equivalent to f(i)?

–2 + i
–2 – i
2 + i
2 – i

Answer 1

D

Explanation:

f(x)=x³-2x²

f(i)=(i)³-2(i)²=i²×i-2(-1)

=-1×i+2

=2-i