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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`y^3 - y/9`
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Solution
We have,
`y^3 - y/9 = y(y^2 - 1/9)`
= `y[y^2 - (1/3)^2]`
= `y(y + 1/3)(y - 1/3)`
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