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4(f(x))² + 1 = 5x - 2
4(f(x))² = 5x - 2 - 1
4(f(x))² = 5x - 3
( f(x))² = (5x - 3)/4
f(x) = √1,25x - 0,75
B) ( G ° F )(x) = g(f(x))
f(x) + 4 = x² + 2x -7
f(x) = x² + 2x -7 - 4 = x² + 2x - 11
NB : Kalau jawaban saya salah, saya minta maaf