Add: 7x³ + 2x² - 5x - 7 and -5x² + x³ + 4x - 5
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Step-by-step explanation:
7x^3 + 2x^2 - 5x -7
x^3 - 5x^2 + 4x -5
on adding, 8x^3 - 3x^2 - x - 12
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