# How do you simplify 18 + 6(9k - 13)?

$54 k - 60$
Before adding we must multiply each of the terms inside the bracket by 6. The $\textcolor{b l u e}{\text{distributive law}}$
$\Rightarrow 6 \left(9 k - 13\right) = \left(6 \times 9 k\right) + \left(6 \times - 13\right) = 54 k - 78$
$\Rightarrow 18 + 6 \left(9 k - 13\right) = 18 + 54 k - 78 = 54 k - 60$