Question

dada a função f (x) = -x^2 + 2x, calcule f (-1) e f (1/2).

Answer 1

f(x) = - x² + 2x
f(-1) = - (-1)² + 2(-1)
f(-1) = - 1 - 2
f(-1) = - 3

f(x) = - x² + 2x
f(1/2) = - (1/2)² + 2(1/2)
f(1/2) = - 1/4 + 1
f(1/2) = 3/4