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Mathematics

Factorise :

ab(x2 + y2) - xy(a2 + b2)

Factorisation

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Answer

ab(x2 + y2) - xy(a2 + b2)

= abx2 + aby2 - xya2 - xyb2

= (abx2 - xya2) + (aby2 - xyb2)

= (abx2 - a2xy) + (aby2 - b2xy)

= ax(bx - ay) + by(ay - bx)

= ax(bx - ay) - by(bx - ay)

= (bx - ay)(ax - by)

Hence,ab(x2 + y2) - xy(a2 + b2) = (bx - ay)(ax - by)

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