$\"\"$

\

The function is $\"\"$ .

\

To find the x - intercept substitute $\"\"$ in the original function $\"\"$ .

\

$\"\"$

\

1. Is the first term a perfect square? Yes, $\"\"$ .

\

2. Is the last term a perfect square? Yes, $\"\"$ .

\

3. Is the middle term to $\"\"$ ? Yes, $\"\"$ .

\

Since all three conditions are satisfied, $\"\"$ is a perfect square trinomial.

\

So, the graph of function intersects the x - axis at one time.

\

The polynomial, $\"\"$ write as $\"\"$ .

\

$\"\"$ . $\"\"$

\

The factor form of equation is $\"\"$ .

\

Set the repeated factor equal to zero.

\

$\"\"$

\

Add 4 to each side.

\

$\"\"$

\

$\"\"$

\

$\"\"$

\

The value of $\"\"$ .