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Verified answer
Kelas 10 MatematikaBab Fungsi Komposisi
f(x) = 3x + 1
(f(x))²
= (3x + 1)²
= 9x² + 6x + 1
f(x²)
= 3x² + 1
2 . f(x)
= 2 (3x + 1)
= 6x + 2
(f(x))² - f(x²) - 2 f(x)
= 9x² + 6x + 1 - 3x² - 1 - 6x - 2
= 6x² - 2