Diketahui (fog)(x) =4x²+8x-3 dan g(x)=2x+4 nilai f(-2)=
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Pertanyaan
Diketahui (fog)(x) =4x²+8x-3 dan g(x)=2x+4 nilai f(-2)=
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1. Jawaban Anonyme
Kelas 10 Matematika
Bab Fungsi Komposisi
(fog) (x) = 4x² + 8x - 3
f(2x + 4) = 4x² + 8x - 3
f(2 . x/2 + 4) = 4 . (x/2)² + 8 . x/2 - 3
f(x + 4) = 4 . x²/4 + 4x - 3
f(x - 4 + 4) = (x - 4)² + 4 (x - 4) - 3
f(x) = x² - 8x + 16 + 4x - 16 - 3
f(-2) = (-2)² - 4 (-2) - 3
f(-2) = 4 + 8 - 3
f(-2) = 9