Question

dada a função f (×) =3×/8 + 2/5 encontre : f (5) f (-2) f (2)

Answer 1

f(x) = 3x/8 + 2/5

f(5) = (3 * 5) / 8 + 2/5
f(5) = 15/8 + 2/5
f(5) = (75 + 16)/40
f(5) = 91/40

f(-2) = (3 * (-2)) / 8 + 2/5
f(-2) = -6/8 + 2/5
f(-2) = -3/4 + 2/5
f(-2) = (-15 + 8) / 20
f(-2) = -7/20

f(2) = (3 * 2) / 8 + 2/5
f(2) = 6/8 + 2/5
f(-2) = 3/4 + 2/5
f(-2) = (15 + 8) / 20
f(-2) = 23/20