Pre-Algebra Examples

$(- 3 x^{2} + 9 x - 9) + (- 9 x^{2} + 9 x + 3)$

Step 1

Remove parentheses.

$- 3 x^{2} + 9 x - 9 - 9 x^{2} + 9 x + 3$

Step 2

Subtract $9 x^{2}$ from $- 3 x^{2}$ .

$- 12 x^{2} + 9 x - 9 + 9 x + 3$

Step 3

Add $9 x$ and $9 x$ .

$- 12 x^{2} + 18 x - 9 + 3$

Step 4

Add $- 9$ and $3$ .

$- 12 x^{2} + 18 x - 6$

$[\begin{array}{c} x^{2} & \frac{1}{2} \\ \sqrt{π} & \int x d x \end{array}]$