suatu fungsi f dinyatakan dengan f(2x-3) = 4x+5. Nilai dari f(-7) adalah...

f (2x - 3) = 4x + 5
Misal :
y = 2x - 3
2x = y + 3
x = (y + 3) / 2

f (2x - 3) = 4x + 5
f (y) = 4 ((y + 3) / 2) + 5
f (y) = 2 (y + 3) + 5
f (y) = 2y + 6 + 5
f (y) = 2y + 11
f (x) = 2x + 11

Nilai f (-7)
= f (-7)
= 2 (-7) + 11
= -14 + 11
= -3