Question

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

–2 + i
–2 – i
2 + i
2 – i

Answer 1

Answer: D

Explanation:

just trust me

Answer 2

f(i) = i³ - 2(i)²

Use the facts, i³ = -i and i² = -1

f(i) = 2 - i