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-2\sqrt{5}\approx -4.472135955
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\sqrt{5}-5\sqrt{5}+\sqrt{20}
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}.
-4\sqrt{5}+\sqrt{20}
Combine \sqrt{5} and -5\sqrt{5} to get -4\sqrt{5}.
-4\sqrt{5}+2\sqrt{5}
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}.
-2\sqrt{5}
Combine -4\sqrt{5} and 2\sqrt{5} to get -2\sqrt{5}.
Examples
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y = 3x + 4
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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Limits
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