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Matematika SMA Kelas X
(gof) (x) = 2x² + 4x + 5
2 f(x) + 3 = 2x² + 4x + 5
2 . f(x) = 2x² + 4x + 5 - 3
f(x) = (2x² + 4x + 2)/2
f(x) = x² + 2x + 1