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(f o g) (x) = f (g (x))
x² - 4 = g (x) + 3
g (x) = - x² + 4 + 3
= - x² + 7
g (x - 2) = - (x - 2)² + 7
= - (x² - 4x + 4) + 7
= - x² + 4x - 4 + 7
= - x² + 4x + 3