Diketahui g (x) = x-1 dan (fog) (x) = 2x-1 ÷ x-1. Nilai dari f(1) adalah... a. 0 b. 1 c.2 d. 3 e.4

Misalkan x-1 = a mk x=a+1
fog = (2x-1)/(x-1)
f(a) = [2(a+1)-1]/[(a+1)-1] = (2a+1)/a
f(x) = (2x+1)/x
f(1) = (2.1+1)/1 = 3 (D)