Evaluate
\frac{2\sqrt{5}}{5}\approx 0.894427191
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\frac{2\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{2}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{2\sqrt{5}}{5}
The square of \sqrt{5} is 5.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
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Matrix
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Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
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Limits
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