Basic Math Examples

$\sqrt{81} - 2 (2 + 1)$

Step 1

Simplify each term.

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Step 1.1

Rewrite $81$ as $9^{2}$ .

$\sqrt{9^{2}} - 2 (2 + 1)$

Step 1.2

Pull terms out from under the radical, assuming positive real numbers.

$9 - 2 (2 + 1)$

Step 1.3

Add $2$ and $1$ .

$9 - 2 \cdot 3$

Step 1.4

Multiply $- 2$ by $3$ .

$9 - 6$

Step 2

Subtract $6$ from $9$ .

$3$