## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$x^2+20x+100$
RECALL: $(a+b)(a+b)=a^2+2ab+b^2$ Using the formula above with $a=x$ and $b=10$, the given expression is equivalent to: $=x^2+2(x)(10)+10^2 \\=x^2+20x+100$