# How do you factor x(10x - 7) + 11(10x - 7)?

$a k + b k = \left(a + b\right) \left(k\right)$
In this case $k$ is an expression, $\left(10 x - 7\right)$, but the rule still applies
$x \left(10 x - 7\right) + 11 \left(10 x - 7\right)$
$= \left(x + 11\right) \left(10 x - 7\right)$