- #1

Monoxdifly

MHB

- 284

- 0

A. \(\displaystyle \frac23x^3+\frac43x^2+3x-2\)

B. \(\displaystyle \frac23x^3+\frac43x^2+3x+2\)

C. \(\displaystyle \frac23x^3+\frac43x^2-3x+2\)

D. \(\displaystyle x^3+2x^2+3x-2\)

E. \(\displaystyle 2x^3+4x^2+3x+2\)

The book says that the answer is A, but I don't understand the part when they suddenly substitute f(-2) = -8, where does that come from? I tried doing it myself and got a (the coefficient of \(\displaystyle x^3\)) as \(\displaystyle -\frac13\). Can you tell me what's wrong?