pliss ada yg bisa bantu??

Diket:
f(x) memenuhi untuk x € bil.asli

f(1) = 3
f(2x) = 4.f(x) + 1
f(2x + 1) = f(x) + 3x - 5

f(11)
= f(2.5 + 1)
= f(5) + 3.5 - 5
= f(5) + 10
= f(2.2 + 1) + 10
= f(2) + 3.2 - 5 + 10
= f(2) + 11
= f(2.1) + 11
= 4.f(1) + 1 + 11
= 4.3 + 12
= 24