$\"\"$

\

The equation is $\"\"$ .

\

(Subtract 18 from each side)

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

(Take out common factor)

\

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

\

(Apply zero product property: If ab = 0 then a = 0 or b = 0)

\

$\"\"$

\

(Add 3 to each side)

\

$\"\"$

\

$\"\"$

\

(Subtract 6 from each side)

\

$\"\"$

\

$\"\"$

\

The solution set is $\"\"$ . $\"\"$

\

(Apply axis of symmetry formula: $\"\"$ )

\

Substitute values (a = 1, and $\"\"$ )

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Now we can find y-value, the x-coordinate of the vertex is $\"\"$ .

\

Substitute $\"\"$ in the equation of $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

Draw a coordinate plane.

\

Draw the equation $\"\"$ .

\

$\"graph$

\

The vertex is at $\"\"$ . Graph the x-intercepts $\"\"$ and $\"\"$ and

\

the vertex is $\"\"$ , connecting them with a smooth curve. $\"\"$

\

The solution set is $\"\"$ and graph of the equation is

\

$\"graph$