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

$9,951$
Since $93=100-7$ and $107=100+7$, then $93 \times 107 = (100-7)(100+7)$. Use the formula $(a-b)(a+b)=a^2-b^2$ with $a=20$ and $b=2$ to obtain: $=100^2-7^2 \\=10,000-49 \\=9,951$