Rewrite it in vertex form:

.

If the leading coefficient is positive, then the vertex (h, k) is the minimum point; if the leading coefficient is negative, then the vertex (h, k) is the maximum point.

So, we complete the square to rewrite the equation in vertex form:

The leading coefficient was positive (a = 1), so the point (6, -27) is the minimum of the parabola.

01