Solve a Quadratic Equation using the Quadratic Formula

Consider the quadratic equation:

$$3x^2 - 12x + 9 = 0$$

Using the quadratic formula, which is given by:

$$x = \f\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$$

where $a = 3$, $b = -12$, and $c = 9$, calculate the values of $x$ that satisfy the equation.