diketahui f(2x+3)=6x+4. Rumus fungsi f(x) adalah

f (2x + 3) = 6x + 4
Misal :
y = 2x + 3
2x = y - 3
x = (y - 3) / 2

f (2x + 3) = 6x + 4
f (y) = 6 ((y - 3) / 2) + 4
f (y) = 3 (y - 3) + 4
f (y) = 3y - 9 + 4
f (y) = 3y - 5
f (x) = 3x - 5

f(2x+3) = 6x+4
= 6(2x+3)
= 12x+15