Answer:
3x^5 - 4x³ - 5x + 8
Explanation:
(x² + 3)(3x³ - 13x) + 34x + 8 =
= 3x^5 - 13x³ + 9x³ - 39x + 34x + 8
= 3x^5 - 4x³ - 5x + 8
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