Question

Dada a função f(x) = x² + 2x - 3, calcule: f(1) + f(2)

A) 4
B) 5
C) 6
D) 7​

Answer 1

Resposta:

$f(1) = {1}^{2} + 2 \times 1 - 3 \\ y = 1 + 2 - 3 \\ y = 0 \\ \\ f(2) = {2}^{2} + 2 \times 2 - 3 \\ y = 4 + 4 - 3 \\ y = 5 \\ \\ f(1) - f(2) \\ 0 - 5 \\ - 5$