Evaluate
2\sqrt{5}\approx 4.472135955
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2\times 3\sqrt{5}-4\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}.
6\sqrt{5}-4\sqrt{5}
Multiply 2 and 3 to get 6.
2\sqrt{5}
Combine 6\sqrt{5} and -4\sqrt{5} to get 2\sqrt{5}.
Examples
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y = 3x + 4
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\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
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\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
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Limits
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