$\"\"$

The equation is $\"\"$ .

Take out common factor 3 from the x-terms.

$\"\"$

Complete the square on the right side.

$\"\"$ $\"\"$

Add and subtract $\"\"$ for we can write complete square.

$\"\"$

The above equation is similar to $\"\"$ .

The vertex of this parabola is located at $\"\"$ ,

The equation of the axis of symmetry is $\"\"$ .

The parabola opens upward. $\"\"$

The vertex of this parabola is located at $\"\"$ .

The equation of the axis of symmetry is $\"\"$ .

The parabola opens upward.