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Question
Factorise the following, using the identity a2 + 2ab + b2 = (a + b)2.
`9x^2 + 2xy + y^2/9`
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Solution
We have,
`9x^2 + 2xy + y^2/9`
= `(3x)^2 + 2 xx 3x xx y/3 + (y/3)^2`
= `(3x + y/3)^2`
= `(3x + y/3)(3x + y/3)`
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