Solve f(x)=x^2-12x

$$f ( x ) = x ^ { 2 } - 12 x$$

Factor

$$x\left(x-12\right)$$

Solution Steps

Factor out x.

$$x\left(x-12\right)$$

Steps Using the Quadratic Formula

Quadratic polynomial can be factored using the transformation ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right), where x_{1} and x_{2} are the solutions of the quadratic equation ax^{2}+bx+c=0.

$$x^{2}-12x=0$$

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.

$$x=\frac{-\left(-12\right)±\sqrt{\left(-12\right)^{2}}}{2}$$

Take the square root of \left(-12\right)^{2}.

$$x=\frac{-\left(-12\right)±12}{2}$$

The opposite of -12 is 12.

$$x=\frac{12±12}{2}$$

Now solve the equation x=\frac{12±12}{2} when ± is plus. Add 12 to 12.

$$x=\frac{24}{2}$$

Divide 24 by 2.

$$x=12$$

Now solve the equation x=\frac{12±12}{2} when ± is minus. Subtract 12 from 12.

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

Divide 0 by 2.

$$x=0$$

Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute 12 for x_{1} and 0 for x_{2}.

$$x^{2}-12x=\left(x-12\right)x$$

Evaluate

$$x\left(x-12\right)$$