Question

se f(x)3x-1/x-7, determine [f(1/2)]²

Answer 1

f(x) = (3x - 1)/(x - 7).  Se x = 1/2, então  f(1/2) = [3(1/2) - 1]/(1/2 - 7) = (3/2 - 1)/(1/2 - 7)
f(1/2) = (1/2)/(-13/2) = -1/13 ⇒  então  [f(1/2)]² = (-1/13)² = 1/169

              Resposta:   [f(1/2)]² = 1/169