Diketahui f(4x-1) = 8x+4 Nilai f(3) adalah...

langsung aja y

misal :
4x - 1 = a
4x = a+1
x = a+1 / 4

soal menjadi →
f(a) = 8(a+1 / 4) + 4
f(a) = 2(a+1) + 4
f(a) = 2a + 2 + 4
f(a) = 2a + 6

f(3) = 2(3) + 6
f(3) = 6 + 6
f(3) = 12

semoga berguna +_+