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Jika (fog)(x)=x²−1 dan g(x)=x+3 maka f(x)=…

Jika (fog)(x)=x²−1 dan g(x)=x+3 maka f(x)=…
A. x²+6x+8
B. x²−6x+8
C. x²−4
D. x²+2
E. x²+8

(f•g)(x) = x²-1
g(x) = x+3 -> g-¹ (x) = x-3
(f•g•g-¹) = (x²-1)•(x-3)
f(x) = (x-3)²-1
= x²-6x+9-1
= x²-6x+8 /B

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