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g(f(x)) = x² - 6x + 5
g(x - 4) = x² - 6x + 5
g(x - 4 + 4) = (x + 4)² - 6(x + 4) + 5
g(x) = x² + 8x + 16 - 6x - 24 + 5
g(x) = x² + 2x - 3
b. g(-3)
= (-3)² + 2(-3) - 3
= 9 - 6 - 3
= 0