Factorise: x2+5xy+4y2 – InterviewSolution

1.

Factorise: x2+5xy+4y2

Answer»

x2 + 5XY + 4y2 = x2 + 4xy + XY + 4y2

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

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

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