To find the sum of the functions, we add them together:
f(x) + g(x) = (5x + 4) + (3x² - 9)
Simplifying, we get:
f(x) + g(x) = 3x² + 9x - 5
Therefore, the sum of the functions is 3x² + 9x - 5, which is option D.
Answer:
8x^2-4x-15
Explanation:
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