Question

10. Factors of x^4 – y^4 are :​

Answer 1

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

this is the ANSWER