Solve : x^2-(p+q)*x+p*q
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it is identity [x+p][x+q]
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x² - (p+q)x +pq
= x² - (px +qx) + pq
= x² - px - qx + pq
= x² -px - qx + pq
= x(x-p) -q (x-p)
= (x-p) (x-q)
= x² - (px +qx) + pq
= x² - px - qx + pq
= x² -px - qx + pq
= x(x-p) -q (x-p)
= (x-p) (x-q)
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