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g(x) = x + 3
(fog)(x) = x² + 4
f(g(x)) = x² + 4
f(x + 3) = x² + 4
f(x + 3 - 3) = (x - 3)²+ 4
f(x) = x² - 6x + 9 + 4
f(x) = x² - 6x + 13