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3\times \frac{\sqrt{50}}{\sqrt{7}}
Rewrite the square root of the division \sqrt{\frac{50}{7}} as the division of square roots \frac{\sqrt{50}}{\sqrt{7}}.
3\times \frac{5\sqrt{2}}{\sqrt{7}}
Factor 50=5^{2}\times 2. Rewrite the square root of the product \sqrt{5^{2}\times 2} as the product of square roots \sqrt{5^{2}}\sqrt{2}. Take the square root of 5^{2}.
3\times \frac{5\sqrt{2}\sqrt{7}}{\left(\sqrt{7}\right)^{2}}
Rationalize the denominator of \frac{5\sqrt{2}}{\sqrt{7}} by multiplying numerator and denominator by \sqrt{7}.
3\times \frac{5\sqrt{2}\sqrt{7}}{7}
The square of \sqrt{7} is 7.
3\times \frac{5\sqrt{14}}{7}
To multiply \sqrt{2} and \sqrt{7}, multiply the numbers under the square root.
\frac{3\times 5\sqrt{14}}{7}
Express 3\times \frac{5\sqrt{14}}{7} as a single fraction.
\frac{15\sqrt{14}}{7}
Multiply 3 and 5 to get 15.