Question

Seja f: R em R a função definida por favor(x)=5x+3. Determine
A) f(4)
B) f(-2)
C) f(-1)+f(0)-f(11)
D) 2f (3)+f(-3).

Answer 1

f(x) = 5x + 3

a) f(4) = 5.4 + 3 = 20 + 3 = 23

b) f(-2) = 5.(-2) + 3 = -10 + 3 = -7

c) f(-1) + f(0) - f(11) = (5.(-1) + 3) + (5.0 + 3) - (5.11 + 3) = -5 + 3 + 0 + 3 - 55 + 3 = -51

d) 2.f(3) + f(-3) = 2.(5.3 + 3) + (5.(-3) + 3) = 2.(15 + 3) + (-15 + 3) = 2.18 - 12 = 24