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Bab Fungsi
Matematika SMP Kelas VIII

f(x) = 5x + 1

1] f(x²) = 5 . x² + 1
           = 5x² + 1

2] f(x) - f(x²) = 5x + 1 - (5x² - 1)
                    = 5x + 1 - 5x² - 1
                    = 5x - 5x²