Solve for y
y = \frac{21}{2} = 10\frac{1}{2} = 10.5
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\sqrt{2y-5}+4-4=8-4
Subtract 4 from both sides of the equation.
\sqrt{2y-5}=8-4
Subtracting 4 from itself leaves 0.
\sqrt{2y-5}=4
Subtract 4 from 8.
2y-5=16
Square both sides of the equation.
2y-5-\left(-5\right)=16-\left(-5\right)
Add 5 to both sides of the equation.
2y=16-\left(-5\right)
Subtracting -5 from itself leaves 0.
2y=21
Subtract -5 from 16.
\frac{2y}{2}=\frac{21}{2}
Divide both sides by 2.
y=\frac{21}{2}
Dividing by 2 undoes the multiplication by 2.
Examples
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{ 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}