Solve 4x(x-2)=0

$$4 x ( x - 2 ) = 0$$

Solve for x

$$x=2$$

$$x=0$$

Steps Using Factoring

Use the distributive property to multiply 4x by x-2.

$$4x^{2}-8x=0$$

Factor out x.

$$x\left(4x-8\right)=0$$

To find equation solutions, solve x=0 and 4x-8=0.

$$x=0 x=2$$

Steps Using the Quadratic Formula

Use the distributive property to multiply 4x by x-2.

$$4x^{2}-8x=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 4 for a, -8 for b, and 0 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{-\left(-8\right)±\sqrt{\left(-8\right)^{2}}}{2\times 4}$$

Take the square root of \left(-8\right)^{2}.

$$x=\frac{-\left(-8\right)±8}{2\times 4}$$

The opposite of -8 is 8.

$$x=\frac{8±8}{2\times 4}$$

Multiply 2 times 4.

$$x=\frac{8±8}{8}$$

Now solve the equation x=\frac{8±8}{8} when ± is plus. Add 8 to 8.

$$x=\frac{16}{8}$$

Divide 16 by 8.

$$x=2$$

Now solve the equation x=\frac{8±8}{8} when ± is minus. Subtract 8 from 8.

$$x=\frac{0}{8}$$

Divide 0 by 8.

$$x=0$$

The equation is now solved.

$$x=2 x=0$$

Steps for Completing the Square

Use the distributive property to multiply 4x by x-2.

$$4x^{2}-8x=0$$

Divide both sides by 4.

$$\frac{4x^{2}-8x}{4}=\frac{0}{4}$$

Dividing by 4 undoes the multiplication by 4.

$$x^{2}+\left(-\frac{8}{4}\right)x=\frac{0}{4}$$

Divide -8 by 4.

$$x^{2}-2x=\frac{0}{4}$$

Divide 0 by 4.

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

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

$$x^{2}-2x+1=1$$

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

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

Take the square root of both sides of the equation.

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

Simplify.

$$x-1=1 x-1=-1$$

Add 1 to both sides of the equation.

$$x=2 x=0$$