Question

Seja f:R-->R a função f(x) = 3x-1. Determine: a) f(2) b) f(-4) c) f(0)-f(1)+f(8)

Answer 1

a)
f(2) = 3.2 - 1
f(2) = 6 - 1
f(2) = 5

b) 
f(-4) = 3(-4) - 1
f(-4) = -12 - 1
f(-4) = -13

c) 
f(0) = 3.0 - 1
f(0)= -1

f(1) = 3.1 - 1
f(1)  = 2

f(8) = 3.8 - 1
f(8) = 24 - 1
f(8) = 23

f(0) - f(1) + f(8)
-1 -2 + 23 =
-3 + 23 = 20