## Algebra 1: Common Core (15th Edition)

$162,409$
...write $403^{2}$ as the square of a binomial. $=(400+3)^{2}$ ...square the binomial. $=400^{2}+2(400)(3)+3^{2}$ ...simplify. $=160,000+2400+9$ ...simplify. =$162,409$