Question

factorize：a4-b4 plz help quick​

Answer 1

$\bold{Given, a^4 −b^4 =(a^2 )^2 −(b^2 )^2}$

$\small\bold{=(a^2+b^2 )(a^2 −b^2 )} \: \: \: \: \: \bold{(∵x^2 −y^2 =(x+y)(x−y))}$

$\bold{=(a^2 +b^2 )(a+b)(a−b) }$