Solve 3x=6x^2

$$3 x = 6 x ^ { 2 }$$

Solve for x

$$x=\frac{1}{2}=0.5$$

$$x=0$$

Steps Using Factoring

Subtract 6x^{2} from both sides.

$$3x-6x^{2}=0$$

Factor out x.

$$x\left(3-6x\right)=0$$

To find equation solutions, solve x=0 and 3-6x=0.

$$x=0 x=\frac{1}{2}$$

Steps Using the Quadratic Formula

Subtract 6x^{2} from both sides.

$$3x-6x^{2}=0$$

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.

$$-6x^{2}+3x=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute -6 for a, 3 for b, and 0 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-3±\sqrt{3^{2}}}{2\left(-6\right)}$$

Take the square root of 3^{2}.

$$x=\frac{-3±3}{2\left(-6\right)}$$

Multiply 2 times -6.

$$x=\frac{-3±3}{-12}$$

Now solve the equation x=\frac{-3±3}{-12} when ± is plus. Add -3 to 3.

$$x=\frac{0}{-12}$$

Divide 0 by -12.

$$x=0$$

Now solve the equation x=\frac{-3±3}{-12} when ± is minus. Subtract 3 from -3.

$$x=-\frac{6}{-12}$$

Reduce the fraction \frac{-6}{-12} to lowest terms by extracting and canceling out 6.

$$x=\frac{1}{2}$$

The equation is now solved.

$$x=0 x=\frac{1}{2}$$

Steps for Completing the Square

Subtract 6x^{2} from both sides.

$$3x-6x^{2}=0$$

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.

$$-6x^{2}+3x=0$$

Divide both sides by -6.

$$\frac{-6x^{2}+3x}{-6}=\frac{0}{-6}$$

Dividing by -6 undoes the multiplication by -6.

$$x^{2}+\frac{3}{-6}x=\frac{0}{-6}$$

Reduce the fraction \frac{3}{-6} to lowest terms by extracting and canceling out 3.

$$x^{2}-\frac{1}{2}x=\frac{0}{-6}$$

Divide 0 by -6.

$$x^{2}-\frac{1}{2}x=0$$

Divide -\frac{1}{2}, the coefficient of the x term, by 2 to get -\frac{1}{4}. Then add the square of -\frac{1}{4} to both sides of the equation. This step makes the left hand side of the equation a perfect square.

$$x^{2}-\frac{1}{2}x+\left(-\frac{1}{4}\right)^{2}=\left(-\frac{1}{4}\right)^{2}$$

Square -\frac{1}{4} by squaring both the numerator and the denominator of the fraction.

$$x^{2}-\frac{1}{2}x+\frac{1}{16}=\frac{1}{16}$$

Factor x^{2}-\frac{1}{2}x+\frac{1}{16}. In general, when x^{2}+bx+c is a perfect square, it can always be factored as \left(x+\frac{b}{2}\right)^{2}.

$$\left(x-\frac{1}{4}\right)^{2}=\frac{1}{16}$$

Take the square root of both sides of the equation.

$$\sqrt{\left(x-\frac{1}{4}\right)^{2}}=\sqrt{\frac{1}{16}}$$

Simplify.

$$x-\frac{1}{4}=\frac{1}{4} x-\frac{1}{4}=-\frac{1}{4}$$

Add \frac{1}{4} to both sides of the equation.

$$x=\frac{1}{2} x=0$$