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\frac{2\sqrt{2}+\sqrt{18}}{2}
Factor 8=2^{2}\times 2. Rewrite the square root of the product \sqrt{2^{2}\times 2} as the product of square roots \sqrt{2^{2}}\sqrt{2}. Take the square root of 2^{2}.
\frac{2\sqrt{2}+3\sqrt{2}}{2}
Factor 18=3^{2}\times 2. Rewrite the square root of the product \sqrt{3^{2}\times 2} as the product of square roots \sqrt{3^{2}}\sqrt{2}. Take the square root of 3^{2}.
\frac{5\sqrt{2}}{2}
Combine 2\sqrt{2} and 3\sqrt{2} to get 5\sqrt{2}.