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0,5\times 2\sqrt{10}+3\sqrt{90}
Factor 40=2^{2}\times 10. Rewrite the square root of the product \sqrt{2^{2}\times 10} as the product of square roots \sqrt{2^{2}}\sqrt{10}. Take the square root of 2^{2}.
\sqrt{10}+3\sqrt{90}
Multiply 0,5 and 2 to get 1.
\sqrt{10}+3\times 3\sqrt{10}
Factor 90=3^{2}\times 10. Rewrite the square root of the product \sqrt{3^{2}\times 10} as the product of square roots \sqrt{3^{2}}\sqrt{10}. Take the square root of 3^{2}.
\sqrt{10}+9\sqrt{10}
Multiply 3 and 3 to get 9.
10\sqrt{10}
Combine \sqrt{10} and 9\sqrt{10} to get 10\sqrt{10}.