Question

factorise the following expression as difference of two square.64-x^4/ y^4
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Answer 1

$64 - \frac{ {x}^{4} }{ {y}^{4} } \\ \\ = {(8})^{2} - ( { \frac{ {x}^{2} }{ {y}^{2} } })^{2} \\ \\ = (8 + \frac{ {x}^{2} }{ {y}^{2} } )(8 - \frac{ {x}^{2} }{ {y}^{2} } )$

I hope this helps.