Answer:
- 3x^2 + 2x - 13
Explanation:
f (x) + g (x) = ( - 4x^2+5x-9) + (x^2 - 3x - 4)
= ( - 4x^2 + x^2) + (5x-3x) + (-9-4)
= - 3x^2 + 2x - 13
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