Question

select a suitable identity and find the following products
$(m^2-n^2)(m^2+n^2)$

Answer 1

$(m^2-n^2)(m^2+n^2)$

Using identity: $(a-b)(a+b)=a^2-b^2$

Therefore,

$(m^2-n^2)(m^2+n^2)$

$={\left(m^2\right)}^2-{\left(n^2\right)}^2$

$=m^4-n^4$