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g(x) = 3x - 12
(g o f)(2)
= g (f(2))
= g (2(2)² + 5(2) - 7)
= g (8 + 10 - 7)
= g (11)
= 3 (11) - 12
= 21
g(x) = 3x-12
(g°f)(x) = g(f(2))
3(2x²+5x-7)-12
3(2(2)²+5(2)-7)-12
3(8+10-7)-12
3(11) - 12
33-12
21
jawabannya B.
maaf kalo salah