Solve Using the Quadratic Formula 9x^2-9x+2=0

$9 x^{2} - 9 x + 2 = 0$

Step 1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 2

Substitute the values $a = 9$ , $b = - 9$ , and $c = 2$ into the quadratic formula and solve for $x$ .

$\frac{9 \pm \sqrt{{(- 9)}^{2} - 4 \cdot (9 \cdot 2)}}{2 \cdot 9}$

Step 3

Simplify.

Simplify the numerator.

Raise $- 9$ to the power of $2$ .

$x = \frac{9 \pm \sqrt{81 - 4 \cdot 9 \cdot 2}}{2 \cdot 9}$

Multiply $- 4 \cdot 9 \cdot 2$ .

Multiply $- 4$ by $9$ .

$x = \frac{9 \pm \sqrt{81 - 36 \cdot 2}}{2 \cdot 9}$

Multiply $- 36$ by $2$ .

$x = \frac{9 \pm \sqrt{81 - 72}}{2 \cdot 9}$

Subtract $72$ from $81$ .

$x = \frac{9 \pm \sqrt{9}}{2 \cdot 9}$

Rewrite $9$ as $3^{2}$ .

$x = \frac{9 \pm \sqrt{3^{2}}}{2 \cdot 9}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \frac{9 \pm 3}{2 \cdot 9}$

Multiply $2$ by $9$ .

$x = \frac{9 \pm 3}{18}$

Simplify $\frac{9 \pm 3}{18}$ .

$x = \frac{3 \pm 1}{6}$

Step 4

The final answer is the combination of both solutions.

$x = \frac{2}{3}, \frac{1}{3}$