multiply x^2-2x-5 by x+3
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(x + 3)(x² - 2x - 5)
x(x² - 2x - 5) + 3(x² - 2x - 5)
x³ - 2x² - 5x + 3x² - 6x - 15
x³ + x² - 11x - 15
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