Diketahui f(2x+1)=4x-9,maka rumus fungsi f(x) ... A.4x+9 B.4x+11 C.2x-11 D.2x+11 (Pake cara)

f(2x+1) = 4x -9
misal :
2x + 1 = a
2x = a -1
x = a-1 /2

f(a) = 4(a-1/2) -9
f(a) = 2a - 2 -9
f(a) = 2a -11
rumus fungsinya : f(x) = 2x -11