31Evaluating f(-2)

$\displaystyle f(x) = 2x^2 - 3x + 1$. Find $\displaystyle f(-2)$.

f(−2) = 15. Substituting x = −2 gives 2(−2)² − 3(−2) + 1 = 2(4) + 6 + 1 = 8 + 6 + 1 = 15.