Complete this factorisation plss
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ab(x² + y²) + xy(a² + b²)
= abx² + aby² + a²xy + b²xy
= abx² + b²xy + aby² + a²xy
= bx(ax + by) + ay(by + ax)
= bx(ax + by) + ay(ax + by)
= (ax + by)(ay + bx) [Answer.]
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