Sendo f(x) = -2x2 + 2x - 12, qual o resultado de: f(2) - f(0) + 2 f(-1) (a) -18 (b) 18 (c) -42 (d) 42 (e) -40

Basta substituir:

f(2) = -2.22 + 2 . 2 - 12

f(2) = - 2.4+4-12

f(2) = - 8 - 8

f(2) = -16

f(0) = -2.02 + 2.0 - 12

f(0) = -12

f(-1) = -2.(-1)2 + 2. -1 -12

f(-1) = -2 -2 -12

f(-1) = -16

2.f(-1) = -32

f(2) - f(0) + 2f(-1) =

-16 - (-12) + (-32) =

-16 + 12 -32 =

-4 -32 = -36

f(2) - f(0) + 2f(-1) = -36

um milhao