Solve for x
x=\frac{y_{2}^{2}}{20}
y_{2}\geq 0
Solve for x (complex solution)
x=\frac{y_{2}^{2}}{20}
arg(y_{2})<\pi \text{ or }y_{2}=0
Solve for y_2 (complex solution)
y_{2}=2\sqrt{5x}
Solve for y_2
y_{2}=2\sqrt{5x}
x\geq 0
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\frac{2\sqrt{5x}}{2}=\frac{y_{2}}{2}
Divide both sides by 2.
\sqrt{5x}=\frac{y_{2}}{2}
Dividing by 2 undoes the multiplication by 2.
5x=\frac{y_{2}^{2}}{4}
Square both sides of the equation.
\frac{5x}{5}=\frac{y_{2}^{2}}{4\times 5}
Divide both sides by 5.
x=\frac{y_{2}^{2}}{4\times 5}
Dividing by 5 undoes the multiplication by 5.
x=\frac{y_{2}^{2}}{20}
Divide \frac{y_{2}^{2}}{4} by 5.
Examples
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{ x } ^ { 2 } - 4 x - 5 = 0
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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}