factor. $s^{2}-20s + 19$

$factor. $s^{2}-20s + 19$$

factor.
$s^{2}-20s + 19$

We need two numbers that multiply to $19$ and add up to $-20$. The numbers are $-1$ and $-19$ since $(-1)\times(-19) = 19$ and $(-1)+(-19)=-20$.

Using the numbers from Step 1, we can factor $s^{2}-20s + 19$ as $(s - 1)(s - 19)$.

$(s - 1)(s - 19)$