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g(x) = 2x - 1
(fog)(x) = 4x² + 10x + 11
misal:
2x - 1 = a
2x = a + 1
x = (a+1)/2
(fog)(x) = 4x² + 10x + 11
f (g(x)) = 4x² + 10x + 11
f (2x-1) = 4x² + 10x + 11
masukkan pemisalan tadi (subtitusi);
f (2x-1) = 4x² + 10x + 11
f (a) = 4((a+1)/2)² + 10((a+1)/2) + 11
f (a) = 4((a² + 2a + 1)/4) + 5(a+1) + 11
f (a) = a² + 2a + 1 + 5a + 5 + 11
f (a) = a² + 7a + 17
f (x) = x² + 7x + 17
f (g(x))= di atas
f ( 2x-1)= 4x2+10x+11
f(x)= x2-3x+12