Answer
$(5+2x)(5-2x)$.
Work Step by Step
The given polynomial is
$= 25-4x^2$
Write the the polynomial as $a^2-b^2$.
$= 5^2-(2x)^2$
Use difference of two square pattern
$a^2-b^2=(a+b)(a-b)$.
We have $a=5$ and $b=2x$.
$= (5+2x)(5-2x)$
Hence, the factor of the polynomial is $(5+2x)(5-2x)$.
