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Answer:
15x³ + 5x² - 6x - 7
Step-by-step explanation:
(7x³+5x²-2x+1) + (8x³-4x+4-12)
(7x³ + 5x² - 2x + 1) + (8x³ - 4x + 4 - 12)
7x³ + 5x² - 2x + 1 + 8x³ - 4x + 4 - 12
7x³ + 8x³ + 5x² - 4x - 2x + 1 - 12 + 4
15x³ + 5x² - 6x - 7