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Q2 Factorise 

(III)

49 x^2 - 36

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This can be factorised as follows
             49 x^2 - 36 = (7x)^{2} - (6)^{2} = (7x - 6)(7x + 6)                                                   (using \ (a)^{2} - (b)^{2} = (a-b)(a+b) )

Posted by

Gautam harsolia

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