Solve P(a)=2x^2-4x

$$P ( a ) = 2 x ^ { 2 } - 4 x$$

Factor

$$2x\left(x-2\right)$$

Solution Steps

Factor out 2.

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

Consider x^{2}-2x. Factor out x.

$$x\left(x-2\right)$$

Rewrite the complete factored expression.

$$2x\left(x-2\right)$$

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.

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

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.

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

Take the square root of \left(-4\right)^{2}.

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

The opposite of -4 is 4.

$$x=\frac{4±4}{2\times 2}$$

Multiply 2 times 2.

$$x=\frac{4±4}{4}$$

Now solve the equation x=\frac{4±4}{4} when ± is plus. Add 4 to 4.

$$x=\frac{8}{4}$$

Divide 8 by 4.

$$x=2$$

Now solve the equation x=\frac{4±4}{4} when ± is minus. Subtract 4 from 4.

$$x=\frac{0}{4}$$

Divide 0 by 4.

$$x=0$$

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

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

Evaluate

$$2x\left(x-2\right)$$