Question
Factorise: $ x^2-36 $
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Answer
$ x^2-36 $
$ =(x)^2-(6)^2\left\{\therefore a^2-b^2=(a+b)(a-b)\right\} $
$ =(x+6)(x-6) $
$ =(x)^2-(6)^2\left\{\therefore a^2-b^2=(a+b)(a-b)\right\} $
$ =(x+6)(x-6) $
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