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प्रश्न
factorise: x2 + 5xy + 4y2
योग
उत्तर
x2 + 5xy + 4y2
= x2 + 4xy + xy + 4y2
= x(x + 4y) + y (x + 4y)
= (x + 4y)(x + y)
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Factorisation by Grouping
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