# Chapter P - Section P.4 - Polynomials - Exercise Set: 35

$25 - 49x^2$

#### Work Step by Step

RECALL: $(a-b)(a+b)=a^2-b^2$ Use the formula above with $a=5$ and $b=7x$ to obtain: $=5^2-(7x)^2 \\=25 - 49x^2$

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