Solve for x
x = \frac{\sqrt{42}}{6} \approx 1.08012345
x = -\frac{\sqrt{42}}{6} \approx -1.08012345
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x=\frac{7}{6x}
Add 2 and 5 to get 7.
x-\frac{7}{6x}=0
Subtract \frac{7}{6x} from both sides.
\frac{x\times 6x}{6x}-\frac{7}{6x}=0
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{6x}{6x}.
\frac{x\times 6x-7}{6x}=0
Since \frac{x\times 6x}{6x} and \frac{7}{6x} have the same denominator, subtract them by subtracting their numerators.
\frac{6x^{2}-7}{6x}=0
Do the multiplications in x\times 6x-7.
6x^{2}-7=0
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 6x.
6x^{2}=7
Add 7 to both sides. Anything plus zero gives itself.
x^{2}=\frac{7}{6}
Divide both sides by 6.
x=\frac{\sqrt{42}}{6} x=-\frac{\sqrt{42}}{6}
Take the square root of both sides of the equation.
x=\frac{7}{6x}
Add 2 and 5 to get 7.
x-\frac{7}{6x}=0
Subtract \frac{7}{6x} from both sides.
\frac{x\times 6x}{6x}-\frac{7}{6x}=0
To add or subtract expressions, expand them to make their denominators the same. Multiply x times \frac{6x}{6x}.
\frac{x\times 6x-7}{6x}=0
Since \frac{x\times 6x}{6x} and \frac{7}{6x} have the same denominator, subtract them by subtracting their numerators.
\frac{6x^{2}-7}{6x}=0
Do the multiplications in x\times 6x-7.
6x^{2}-7=0
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 6x.
x=\frac{0±\sqrt{0^{2}-4\times 6\left(-7\right)}}{2\times 6}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 6 for a, 0 for b, and -7 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{0±\sqrt{-4\times 6\left(-7\right)}}{2\times 6}
Square 0.
x=\frac{0±\sqrt{-24\left(-7\right)}}{2\times 6}
Multiply -4 times 6.
x=\frac{0±\sqrt{168}}{2\times 6}
Multiply -24 times -7.
x=\frac{0±2\sqrt{42}}{2\times 6}
Take the square root of 168.
x=\frac{0±2\sqrt{42}}{12}
Multiply 2 times 6.
x=\frac{\sqrt{42}}{6}
Now solve the equation x=\frac{0±2\sqrt{42}}{12} when ± is plus.
x=-\frac{\sqrt{42}}{6}
Now solve the equation x=\frac{0±2\sqrt{42}}{12} when ± is minus.
x=\frac{\sqrt{42}}{6} x=-\frac{\sqrt{42}}{6}
The equation is now solved.
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}