Solve for x
x=-\frac{5}{8}=-0.625
x = -\frac{9}{8} = -1\frac{1}{8} = -1.125
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8x+7=2 8x+7=-2
Take the square root of both sides of the equation.
8x+7-7=2-7 8x+7-7=-2-7
Subtract 7 from both sides of the equation.
8x=2-7 8x=-2-7
Subtracting 7 from itself leaves 0.
8x=-5
Subtract 7 from 2.
8x=-9
Subtract 7 from -2.
\frac{8x}{8}=-\frac{5}{8} \frac{8x}{8}=-\frac{9}{8}
Divide both sides by 8.
x=-\frac{5}{8} x=-\frac{9}{8}
Dividing by 8 undoes the multiplication by 8.
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}