Question

factorise using formula

a^2-b^2 = (a+b) (a-b)​

Answer 1

${\pink{\underline{hola}}}$

${a^2+b^2=(a+b)(a-b)}$

${x^4-y^4}$

can be written as

${(x^2)}^2-{(y^2)}^2$
${(x^2+y^2)(x^2-y^2)}$

${(x+y)(x-y)(x^2-y^2)}$