we have
Convert to vertex form
we know that
the equation of a vertical parabola in vertex form is equal to
where
(h,k) is the vertex
Group terms that contain the same variable, and move the constant to the opposite side of the equation
Complete the square. Remember to balance the equation by adding the same constants to each side
Rewrite as perfect squares
the vertex is the point
therefore
<u>the answer is </u>
The y-value of the vertex is