Pre-Algebra Examples

$- 3^{2} + 4 (18 + (12 - 20))$

Step 1

Remove parentheses.

$- 3^{2} + 4 (18 + 12 - 20)$

Step 2

Simplify each term.

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Step 2.1

Raise $3$ to the power of $2$ .

$- 1 \cdot 9 + 4 (18 + 12 - 20)$

Step 2.2

Multiply $- 1$ by $9$ .

$- 9 + 4 (18 + 12 - 20)$

Step 2.3

Add $18$ and $12$ .

$- 9 + 4 (30 - 20)$

Step 2.4

Subtract $20$ from $30$ .

$- 9 + 4 \cdot 10$

Step 2.5

Multiply $4$ by $10$ .

$- 9 + 40$

$- 9 + 40$

Step 3

Add $- 9$ and $40$ .

$31$

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