diketahui f(2x-1)= 4x+4, maka f(4) adalah

misal f(x) = ax + b
maka
f(2x - 1) = a(2x - 1) + b
4x + 4 = 2ax - a + b

2ax = 4x
a = 2

-a + b = 4
-2 + b = 4
b = 6
sehingga f(x) = 2x + 6
f(4) = 2(4) + 6 = 8 + 6 = 14