quadratic polynomial having zeros -1and -2 is what
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roots of equation = -1 & -2
equation => x² - (sum of roots)x + product of roots = 0
=> x² - {-1+(-2)}x + (-1)(-2) = 0
=> x² + 3x + 2 = 0
equation => x² - (sum of roots)x + product of roots = 0
=> x² - {-1+(-2)}x + (-1)(-2) = 0
=> x² + 3x + 2 = 0
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