factorise
ab (x2+y2)-xy (a2+b2)
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Step-by-step explanation:
Ab ( x^2 + y^2) - xy ( a^2 + b^2)
= abx^2 + aby^2 - xya^2 - xyb^2
= abx^2 - xya^2 + aby^2 - xyb^2
= ax ( bx - ay) + by ( ay - bx)
= ax ( bx - ay) - by ( bx - ay)
= (ax - by) (bx - ay)
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