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x=\frac{2\sqrt{63}}{16}
Multiply 21 and 3 to get 63.
x=\frac{2\times 3\sqrt{7}}{16}
Factor 63=3^{2}\times 7. Rewrite the square root of the product \sqrt{3^{2}\times 7} as the product of square roots \sqrt{3^{2}}\sqrt{7}. Take the square root of 3^{2}.
x=\frac{6\sqrt{7}}{16}
Multiply 2 and 3 to get 6.
x=\frac{3}{8}\sqrt{7}
Divide 6\sqrt{7} by 16 to get \frac{3}{8}\sqrt{7}.