Suatu fungsi f (2x-1) 4x+5 .maka nilai f (9) adalah

f(2x - 1) = 4x + 5
f (9) = ?
Cari nilai x dulu , jika 2x -1 = 9
2x - 1= 9
2x = 9+1
2x = 10
x = 5

f(9) = 4(5) +5
=20 + 5
= 25