2. Factorize :-(y - x)a + (y - x)b
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Answer:
ab(x2 + y2) - xy(a2 + b2)
By suitably rearranging the terms, we have;
= abx2 + aby2 - a2xy - b2xy
= abx2 - a2xy - b2xy + aby2
= ax(bx - ay) - by(bx - ay)
= (bx - ay) (ax - by)
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