Tentukan nilai a jika f(a)=1/2 dan f(x)=4/(x+1) Tolong kerjakan dgn caranya ya!

F(x) = 4 / (x + 1)
f(a) = 4 / (a + 1)
½ = 4 / (a + 1)
a + 1 = 2 . 4
a + 1 = 8
a = 8 – 1 = 7