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Choose the correct sum of the polynomials (3x3 − 5x − 8) + (5x3 + 7x + 3).

8x3 + 2x + 5
2x3 − 12x − 11
2x3 + 12x − 5
8x3 + 2x − 5

1 answer

(3x^3 - 5x - 8) + (5x^3 + 7x + 3) = 3x^3 - 5x - 8 + 5x^3 + 7x + 3
= (3x^3 + 5x^3) + (-5x + 7x) + (-8 + 3)
= 8x^3 + 2x - 5

Therefore, the correct sum is 8x^3 + 2x - 5.
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