Evaluate
4
Factor
2^{2}
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\frac{4\sqrt{5}}{\sqrt{5}}
Combine \sqrt{5} and 3\sqrt{5} to get 4\sqrt{5}.
\frac{4\sqrt{5}\sqrt{5}}{\left(\sqrt{5}\right)^{2}}
Rationalize the denominator of \frac{4\sqrt{5}}{\sqrt{5}} by multiplying numerator and denominator by \sqrt{5}.
\frac{4\sqrt{5}\sqrt{5}}{5}
The square of \sqrt{5} is 5.
\frac{4\times 5}{5}
Multiply \sqrt{5} and \sqrt{5} to get 5.
\frac{20}{5}
Multiply 4 and 5 to get 20.
4
Divide 20 by 5 to get 4.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
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
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}