Question

dada a função f(x) = 2x-4, calcule: a) f (1\2) b) f (-5) c) f(x) =0. d) f ( 2,5 ) por favor me ajudem

Answer 1

Basta substituir:

a) f(1/2) = 2(1/2) - 4
f(1/2) = 2/2 - 4
f(1/2) = 2 - 4
f(1/2) = -2

b) f(-5) = 2(-5) - 4
f(-5) = -14

c) f(x) = 0, logo:
2x - 4 = 0
2x = 4
x = 2

d) f(2,5) = 2(2,5) - 4
f(2,5) = 5 - 4
f(2,5) = 1