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3x-x\left(x-1\right)=0\times 6\times 3x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3.
3x-\left(x^{2}-x\right)=0\times 6\times 3x
Use the distributive property to multiply x by x-1.
3x-x^{2}-\left(-x\right)=0\times 6\times 3x
To find the opposite of x^{2}-x, find the opposite of each term.
3x-x^{2}+x=0\times 6\times 3x
The opposite of -x is x.
4x-x^{2}=0\times 6\times 3x
Combine 3x and x to get 4x.
4x-x^{2}=0\times 3x
Multiply 0 and 6 to get 0.
4x-x^{2}=0x
Multiply 0 and 3 to get 0.
4x-x^{2}=0
Anything times zero gives zero.
x\left(4-x\right)=0
Factor out x.
x=0 x=4
To find equation solutions, solve x=0 and 4-x=0.
x=4
Variable x cannot be equal to 0.
3x-x\left(x-1\right)=0\times 6\times 3x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3.
3x-\left(x^{2}-x\right)=0\times 6\times 3x
Use the distributive property to multiply x by x-1.
3x-x^{2}-\left(-x\right)=0\times 6\times 3x
To find the opposite of x^{2}-x, find the opposite of each term.
3x-x^{2}+x=0\times 6\times 3x
The opposite of -x is x.
4x-x^{2}=0\times 6\times 3x
Combine 3x and x to get 4x.
4x-x^{2}=0\times 3x
Multiply 0 and 6 to get 0.
4x-x^{2}=0x
Multiply 0 and 3 to get 0.
4x-x^{2}=0
Anything times zero gives zero.
-x^{2}+4x=0
All equations of the form ax^{2}+bx+c=0 can be solved using the quadratic formula: \frac{-b±\sqrt{b^{2}-4ac}}{2a}. The quadratic formula gives two solutions, one when ± is addition and one when it is subtraction.
x=\frac{-4±\sqrt{4^{2}}}{2\left(-1\right)}
This equation is in standard form: ax^{2}+bx+c=0. Substitute -1 for a, 4 for b, and 0 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.
x=\frac{-4±4}{2\left(-1\right)}
Take the square root of 4^{2}.
x=\frac{-4±4}{-2}
Multiply 2 times -1.
x=\frac{0}{-2}
Now solve the equation x=\frac{-4±4}{-2} when ± is plus. Add -4 to 4.
x=0
Divide 0 by -2.
x=-\frac{8}{-2}
Now solve the equation x=\frac{-4±4}{-2} when ± is minus. Subtract 4 from -4.
x=4
Divide -8 by -2.
x=0 x=4
The equation is now solved.
x=4
Variable x cannot be equal to 0.
3x-x\left(x-1\right)=0\times 6\times 3x
Variable x cannot be equal to 0 since division by zero is not defined. Multiply both sides of the equation by 3x, the least common multiple of x,3.
3x-\left(x^{2}-x\right)=0\times 6\times 3x
Use the distributive property to multiply x by x-1.
3x-x^{2}-\left(-x\right)=0\times 6\times 3x
To find the opposite of x^{2}-x, find the opposite of each term.
3x-x^{2}+x=0\times 6\times 3x
The opposite of -x is x.
4x-x^{2}=0\times 6\times 3x
Combine 3x and x to get 4x.
4x-x^{2}=0\times 3x
Multiply 0 and 6 to get 0.
4x-x^{2}=0x
Multiply 0 and 3 to get 0.
4x-x^{2}=0
Anything times zero gives zero.
-x^{2}+4x=0
Quadratic equations such as this one can be solved by completing the square. In order to complete the square, the equation must first be in the form x^{2}+bx=c.
\frac{-x^{2}+4x}{-1}=\frac{0}{-1}
Divide both sides by -1.
x^{2}+\frac{4}{-1}x=\frac{0}{-1}
Dividing by -1 undoes the multiplication by -1.
x^{2}-4x=\frac{0}{-1}
Divide 4 by -1.
x^{2}-4x=0
Divide 0 by -1.
x^{2}-4x+\left(-2\right)^{2}=\left(-2\right)^{2}
Divide -4, the coefficient of the x term, by 2 to get -2. Then add the square of -2 to both sides of the equation. This step makes the left hand side of the equation a perfect square.
x^{2}-4x+4=4
Square -2.
\left(x-2\right)^{2}=4
Factor x^{2}-4x+4. 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-2\right)^{2}}=\sqrt{4}
Take the square root of both sides of the equation.
x-2=2 x-2=-2
Simplify.
x=4 x=0
Add 2 to both sides of the equation.
x=4
Variable x cannot be equal to 0.