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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/9 - y^2/25`
Solution
We have,
`x^2/9 - y^2/25 = (x/3)^2 - (y/5)^2`
= `(x/3 - y/5)(x/3 + y/5)`
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