## College Algebra (6th Edition)

$x^4y^4-10x^2y^2+25$
$$(x^2y^2-5)^2$$ The square of a binomial can be solved using this formula: $(a-b)^2=a^2-2ab+b^2$ $$=(x^2y^2)^2-2(x^2y^2)(5)+5^2$$ $$=x^4y^4-10x^2y^2+25$$