diketahui fungsi f(x + 4) = 8x + 20. maka rumus fungsi f(x) adalah...

f(x + 4) = 8x + 20
Misal x + 4 = a maka x = a - 4

f(x + 4) = 8x + 20
f(a) = 8(a - 4) + 20
f(a) = 8a - 32 + 20
f(x) = 8x - 12
Rumus f(x)
f(x) = 4(2x - 3)