Solve for x
x=14
Graph
Share
Copied to clipboard
-\sqrt{x+2}+7-7=3-7
Subtract 7 from both sides of the equation.
-\sqrt{x+2}=3-7
Subtracting 7 from itself leaves 0.
-\sqrt{x+2}=-4
Subtract 7 from 3.
\frac{-\sqrt{x+2}}{-1}=-\frac{4}{-1}
Divide both sides by -1.
\sqrt{x+2}=-\frac{4}{-1}
Dividing by -1 undoes the multiplication by -1.
\sqrt{x+2}=4
Divide -4 by -1.
x+2=16
Square both sides of the equation.
x+2-2=16-2
Subtract 2 from both sides of the equation.
x=16-2
Subtracting 2 from itself leaves 0.
x=14
Subtract 2 from 16.
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}