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Question
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/8 - y^2/18`
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Solution
We have,
`x^2/8 - y^2/18 = 1/2(x^2/4 - y^2/9)`
= `1/2[(x/2)^2 - (y/3)^2]`
= `1/2(x/2 + y/3)(x/2 - y/3)`
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