Precalculus Examples

$\sqrt{28}$

Step 1

Rewrite $28$ as $2^{2} \cdot 7$ .

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Step 1.1

Factor $4$ out of $28$ .

$\sqrt{4 (7)}$

Step 1.2

Rewrite $4$ as $2^{2}$ .

$\sqrt{2^{2} \cdot 7}$

$\sqrt{2^{2} \cdot 7}$

Step 2

Pull terms out from under the radical.

$2 \sqrt{7}$

Step 3

The result can be shown in multiple forms.

Exact Form:

$2 \sqrt{7}$

Decimal Form:

$5.29150262 \dots$

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