Answer:
The correct answer is -6x^3 + 4x^2 + 4x - 8
Explanation:
6x³ + 4x - 2
note that (f + g)(x) = f(x) + g(x) , so
f(x) + g(x)
= 2x² + 4x - 5 + 6x³ - 2x² + 3 ← collect like terms
= 6x³ + 4x - 2
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