# How do you evaluate (- 7k + 2s - 3q ) - ( - 2q - 3k ) + ( 4k + q - 2s )?

Jan 30, 2018

0

#### Explanation:

Let’s start by making the equation to addition format (as it is easier to evaluate).

Note: Negative x Negative = Positive

So $\left(- 7 k + 2 s - 3 q\right) - \left(- 2 q - 3 k\right) + \left(4 k + q - 2 s\right)$

Becomes $\left(- 7 k + 2 s - 3 q\right) + \left(2 q + 3 k\right) + \left(4 k + q - 2 s\right)$

Now we can group all the like terms together; move all the same variables together. Ill arrange it in brackets for you to get a better visual.

$\left(- 7 k + 2 s - 3 q\right) + \left(2 q + 3 k\right) + \left(4 k + q - 2 s\right)$

$\left(- 7 k + 3 k + 4 k\right) + \left(2 s - 2 s\right) + \left(- 3 q + 2 q + q\right)$

$\left(- 7 k + 7 k\right) + \left(2 s - 2 s\right) + \left(- 3 q + 3 q\right)$

$0 + 0 + 0 = 0$