Simplify the Radical Expression ( square root of 21)/( square root of 15)

$\frac{\sqrt{21}}{\sqrt{15}}$

Combine $\sqrt{21}$ and $\sqrt{15}$ into a single radical.

$\sqrt{\frac{21}{15}}$

Cancel the common factor of $21$ and $15$ .

Factor $3$ out of $21$ .

$\sqrt{\frac{3 (7)}{15}}$

Cancel the common factors.

Factor $3$ out of $15$ .

$\sqrt{\frac{3 \cdot 7}{3 \cdot 5}}$

Cancel the common factor.

$\sqrt{\frac{3 \cdot 7}{3 \cdot 5}}$

Rewrite the expression.

$\sqrt{\frac{7}{5}}$

Rewrite $\sqrt{\frac{7}{5}}$ as $\frac{\sqrt{7}}{\sqrt{5}}$ .

$\frac{\sqrt{7}}{\sqrt{5}}$

Multiply $\frac{\sqrt{7}}{\sqrt{5}}$ by $\frac{\sqrt{5}}{\sqrt{5}}$ .

$\frac{\sqrt{7}}{\sqrt{5}} \cdot \frac{\sqrt{5}}{\sqrt{5}}$

Combine and simplify the denominator.

Multiply $\frac{\sqrt{7}}{\sqrt{5}}$ by $\frac{\sqrt{5}}{\sqrt{5}}$ .

$\frac{\sqrt{7} \sqrt{5}}{\sqrt{5} \sqrt{5}}$

Raise $\sqrt{5}$ to the power of $1$ .

$\frac{\sqrt{7} \sqrt{5}}{{\sqrt{5}}^{1} \sqrt{5}}$

Raise $\sqrt{5}$ to the power of $1$ .

$\frac{\sqrt{7} \sqrt{5}}{{\sqrt{5}}^{1} {\sqrt{5}}^{1}}$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$\frac{\sqrt{7} \sqrt{5}}{{\sqrt{5}}^{1 + 1}}$

Add $1$ and $1$ .

$\frac{\sqrt{7} \sqrt{5}}{{\sqrt{5}}^{2}}$

Rewrite ${\sqrt{5}}^{2}$ as $5$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{5}$ as $5^{\frac{1}{2}}$ .

$\frac{\sqrt{7} \sqrt{5}}{{(5^{\frac{1}{2}})}^{2}}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$\frac{\sqrt{7} \sqrt{5}}{5^{\frac{1}{2} \cdot 2}}$

Combine $\frac{1}{2}$ and $2$ .

$\frac{\sqrt{7} \sqrt{5}}{5^{\frac{2}{2}}}$

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{\sqrt{7} \sqrt{5}}{5^{\frac{2}{2}}}$

Rewrite the expression.

$\frac{\sqrt{7} \sqrt{5}}{5^{1}}$

Evaluate the exponent.

$\frac{\sqrt{7} \sqrt{5}}{5}$

Simplify the numerator.

Combine using the product rule for radicals.

$\frac{\sqrt{7 \cdot 5}}{5}$

Multiply $7$ by $5$ .

$\frac{\sqrt{35}}{5}$

The result can be shown in multiple forms.

Exact Form:

$\frac{\sqrt{35}}{5}$

Decimal Form:

$1.18321595 \dots$

Simplify the Radical Expression ( square root of 21)/( square root of 15)

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