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Factorise : x^2 + 5xy + 4y^2​​​​​​​

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Factorise : x2 + 5xy + 4y2

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x2 + 5xy + ay2 = x2 + 4xy + xy + 4y2 

= x(x+4y) + y(x+4y)

= (x+4y) (x+y)

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