Question

Dada a função definida por f(x) = 5x - 8, calcule:

A) f(0)
B) f(2/3)
C) x tal que f(x) = 0
D) x tal que f(x) = 7

Answer 1

a) f(0) = 5 * 0 - 8 = -8
b) f(2/3) = 5 * 2/3 - 8 = 10/3 - 24/3 = -14/3
c) x tal que f(x) = 0 -> 5x - 8 = 0 -> 5x = 8 -> x = 8/5
d) x tal que f(x) = 7 -> 5x - 8 = 7 -> 5x = 15 -> x = 3