Answer
$49x^2y^4-100y^2$
Work Step by Step
$$(7xy^2-10y)(7xy^2+10y)$$ The product of the sum and the difference of two terms can be found using this formula: $(a-b)(a+b) = a^2-b^2$. $$=(7xy^2)^2-(10y)^2$$ $$=49x^2y^4-100y^2$$
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