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(gof)(x) = 2x² + 4x + 5
g(f(x)) = 2x² + 4x + 5
2.f(x) + 3 = 2x² + 4x + 5
2.f(x) = 2x² + 4x + 5 - 3
2.f(x) = 2x² + 4x + 2
f(x) = x² + 2x + 1
g{f(x)} = 2x² + 4x +5
2{f(x)} + 3 = 2x² + 4x +5
f(x) =( 2x² + 4x +5 -3) / 2
f(x) =( 2x² + 4x +2) / 2
f(x) = x² + 2x + 1