Answer
$225$.
Work Step by Step
The given polynomial is
$= 39^2-36^2$
Use difference of two square pattern
$a^2-b^2=(a+b)(a-b)$.
We have $a=39$ and $b=36$.
$= (39+36)(39-36)$
Simplify.
$= (75)(3)$
Multiply.
$= 225$
Hence, the solution is $225$.
