Solve 45x^2-2x

$$45 x ^ { 2 } - 2 x$$

Factor

$$x\left(45x-2\right)$$

Solution Steps

Factor out x.

$$x\left(45x-2\right)$$

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.

$$45x^{2}-2x=0$$

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.

$$x=\frac{-\left(-2\right)±\sqrt{\left(-2\right)^{2}}}{2\times 45}$$

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

$$x=\frac{-\left(-2\right)±2}{2\times 45}$$

The opposite of -2 is 2.

$$x=\frac{2±2}{2\times 45}$$

Multiply 2 times 45.

$$x=\frac{2±2}{90}$$

Now solve the equation x=\frac{2±2}{90} when ± is plus. Add 2 to 2.

$$x=\frac{4}{90}$$

Reduce the fraction \frac{4}{90} to lowest terms by extracting and canceling out 2.

$$x=\frac{2}{45}$$

Now solve the equation x=\frac{2±2}{90} when ± is minus. Subtract 2 from 2.

$$x=\frac{0}{90}$$

Divide 0 by 90.

$$x=0$$

Factor the original expression using ax^{2}+bx+c=a\left(x-x_{1}\right)\left(x-x_{2}\right). Substitute \frac{2}{45} for x_{1} and 0 for x_{2}.

$$45x^{2}-2x=45\left(x-\frac{2}{45}\right)x$$

Subtract \frac{2}{45} from x by finding a common denominator and subtracting the numerators. Then reduce the fraction to lowest terms if possible.

$$45x^{2}-2x=45\times \frac{45x-2}{45}x$$

Cancel out 45, the greatest common factor in 45 and 45.

$$45x^{2}-2x=\left(45x-2\right)x$$

Evaluate

$$x\left(45x-2\right)$$