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\frac{2\times 3\sqrt{5}+3\sqrt{20}}{2\sqrt{3}}
Factor 45=3^{2}\times 5. Rewrite the square root of the product \sqrt{3^{2}\times 5} as the product of square roots \sqrt{3^{2}}\sqrt{5}. Take the square root of 3^{2}.
\frac{6\sqrt{5}+3\sqrt{20}}{2\sqrt{3}}
Multiply 2 and 3 to get 6.
\frac{6\sqrt{5}+3\times 2\sqrt{5}}{2\sqrt{3}}
Factor 20=2^{2}\times 5. Rewrite the square root of the product \sqrt{2^{2}\times 5} as the product of square roots \sqrt{2^{2}}\sqrt{5}. Take the square root of 2^{2}.
\frac{6\sqrt{5}+6\sqrt{5}}{2\sqrt{3}}
Multiply 3 and 2 to get 6.
\frac{12\sqrt{5}}{2\sqrt{3}}
Combine 6\sqrt{5} and 6\sqrt{5} to get 12\sqrt{5}.
\frac{6\sqrt{5}}{\sqrt{3}}
Cancel out 2 in both numerator and denominator.
\frac{6\sqrt{5}\sqrt{3}}{\left(\sqrt{3}\right)^{2}}
Rationalize the denominator of \frac{6\sqrt{5}}{\sqrt{3}} by multiplying numerator and denominator by \sqrt{3}.
\frac{6\sqrt{5}\sqrt{3}}{3}
The square of \sqrt{3} is 3.
\frac{6\sqrt{15}}{3}
To multiply \sqrt{5} and \sqrt{3}, multiply the numbers under the square root.
2\sqrt{15}
Divide 6\sqrt{15} by 3 to get 2\sqrt{15}.