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Verified answer
Bab FungsiMatematika 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