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5\sqrt{5}-\sqrt{45}+\sqrt[4]{25}-3\sqrt{5}
Factor 125=5^{2}\times 5. Rewrite the square root of the product \sqrt{5^{2}\times 5} as the product of square roots \sqrt{5^{2}}\sqrt{5}. Take the square root of 5^{2}.
5\sqrt{5}-3\sqrt{5}+\sqrt[4]{25}-3\sqrt{5}
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}.
2\sqrt{5}+\sqrt[4]{25}-3\sqrt{5}
Combine 5\sqrt{5} and -3\sqrt{5} to get 2\sqrt{5}.
\sqrt[4]{25}=\sqrt[4]{5^{2}}=5^{\frac{2}{4}}=5^{\frac{1}{2}}=\sqrt{5}
Rewrite \sqrt[4]{25} as \sqrt[4]{5^{2}}. Convert from radical to exponential form and cancel out 2 in the exponent. Convert back to radical form.
2\sqrt{5}+\sqrt{5}-3\sqrt{5}
Insert the obtained value back in the expression.
3\sqrt{5}-3\sqrt{5}
Combine 2\sqrt{5} and \sqrt{5} to get 3\sqrt{5}.
0
Combine 3\sqrt{5} and -3\sqrt{5} to get 0.