Question

seja a funçao f: R->R definida por f(x) = 2x - 3.Calcule : f(-5)

Answer 1

f(-5) = 2.(-5)-3
f(-5) = -10-3
f(-5) = -13

Answer 2

$f(-5) = 2x - 3\to \\\\ 2*(-5)- 3\to \\\\ -10-3\to \\\\-13$