Answer:
g(x + h) = -x² + 2hx - h² - 3x + 3h
Explanation:
g(x) = -x² - 3x
g(x + h) = -(x - h)² - 3(x - h)
g(x + h) = -(x² - 2hx + h²) - 3x + 3h
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