Question

1. Calcule f(−1) e f(12)sendo f(x) = −x2 + 2x.

Answer 1

Olá,

f(x) = -x²+2x

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

f(12) = -(12)²+2(12)
f(12) = -(144)+2(12)
f(12) = -144+24
f(12) = -120