Find the quadratic polynomial whose zeroes are 2,-1
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Let apha an beta are the zeros of poly.
alpha = 2. beta= -1
alpha +beta = 2+ (-1) = 1
alpha× beta = 2×(-1) = -2
P(x) = k[x² - (alpha+beta)x + (alpha×beta)]
= k[x² - 1x + (-2)
= k[x² -1 x -2]
quadratic polynomial = x² -1x -2
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