Solve for x
x=6
x=0
Graph
Share
Copied to clipboard
x^{2}-6x=0
Subtract 6x from both sides.
x\left(x-6\right)=0
Factor out x.
x=0 x=6
To find equation solutions, solve x=0 and x-6=0.
x^{2}-6x=0
Subtract 6x from both sides.
x=\frac{-\left(-6\right)±\sqrt{\left(-6\right)^{2}}}{2}
This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, -6 for b, and 0 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{-\left(-6\right)±6}{2}
Take the square root of \left(-6\right)^{2}.
x=\frac{6±6}{2}
The opposite of -6 is 6.
x=\frac{12}{2}
Now solve the equation x=\frac{6±6}{2} when ± is plus. Add 6 to 6.
x=6
Divide 12 by 2.
x=\frac{0}{2}
Now solve the equation x=\frac{6±6}{2} when ± is minus. Subtract 6 from 6.
x=0
Divide 0 by 2.
x=6 x=0
The equation is now solved.
x^{2}-6x=0
Subtract 6x from both sides.
x^{2}-6x+\left(-3\right)^{2}=\left(-3\right)^{2}
Divide -6, the coefficient of the x term, by 2 to get -3. Then add the square of -3 to both sides of the equation. This step makes the left hand side of the equation a perfect square.
x^{2}-6x+9=9
Square -3.
\left(x-3\right)^{2}=9
Factor x^{2}-6x+9. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.
\sqrt{\left(x-3\right)^{2}}=\sqrt{9}
Take the square root of both sides of the equation.
x-3=3 x-3=-3
Simplify.
x=6 x=0
Add 3 to both sides of the equation.
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}