# How do you simplify (3r ^ { 2} - 1) - ( 3r + 6)?

Mar 10, 2017

$3 {r}^{2} - 3 r - 7$

#### Explanation:

Original Equation: (3r^2−1)−(3r+6)

First, distribute the negative through the second set of parentheses.

3r2−1−3r-6

Now, all you need to do is combine like terms.

$3 {r}^{2} - 3 r - 7$