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

SOMEONE ASKED 👇

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

HERE THE ANSWERS 👇

• 2 – i

• f(i) = i³ – 2(i)²

  Use the facts, i³ = -i and i² = -1

  f(i) = 2 – i

• i^3 = -i and 2i^2 = -2, so the answer is

  +2-i