Work Step by Step
Given:$(2x+7y)(2x-7y)$ Apply Formula: $(a-b)(a+b)=a^2-b^2$ This implies $(2x+7y)(2x-7y)=(2x)^2-(7y)^2$ or, $=4x^2-49y^2$ Hence, the result is : $4x^2-49y^2$
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