Question

x^4-y^4 + x^² - y^² factorize​

Answer 1

Answer:

$= {x}^{4} - {y}^{4} + {x}^{2} - {y}^{2} \\ \\ = {x}^{4} + {x}^{2} - {y}^{4} - {y}^{2} \\ \\ = {x}^{2} ( {x}^{2} + 1) - {y}^{2} ( {y}^{2} + 1) \\ \\ = ( {x}^{2} - {y}^{2} )( {x}^{2} + 1)( {y}^{2} + 1)$