$\"\"$

The function is $\"\"$ .

Write the function in vertex form.

$\"\"$ (Original function)

$\"\"$ (It is not a perfect square)

$\"\"$ (Complete the square by add and subtract $\"\"$ )

$\"\"$ (Write $\"\"$ as a perfect square)

$\"\"$ .

$\"\"$

Vertex form of the function $\"\"$ is $\"\"$ .