The standard form of the equation of a parabola is x = y2 + 10y + 22. What is the vertex form of the equation?

From the conics form of the equation, shown above, I look at what's multiplied on the unsquaredpart and see that 4p = 4, so p = 1. Then the focus is one unit above the vertex, at (0, 1), and the directrix is the horizontal line y = - 1, one unit below the vertex.

vertex: (0, 0); focus: (0, 1); axis of symmetry: x = 0; directrix: y = - 1

Graph y2 + 10y + x + 25 = 0, and state the vertex, focus, axis of symmetry, and directrix.

Since the y is squared in this equation, rather than the x, then this is a "sideways" parabola. To graph, I'll do my T-chart backwards, picking y-values first and then finding the corresponding x-values for x = - y2 - 10y - 25:

To convert the equation into conics form and find the exact vertex, etc, I'll need to convert the equation to perfect-square form. In this case, the squared side is already a perfect square, so:

y2 + 10y + 25 = - x

(y + 5) 2 = - 1 (x - 0)

This tells me that 4p = - 1, so p = - 1/4. Since the parabola opens to the left, then the focus is 1/4 units to the left of the vertex. I can see from the equation above that the vertex is at (h, k) = (0, - 5), so then the focus must be at (-1/4, - 5). The parabola is sideways, so the axis of symmetry is, too. The directrix, being perpendicular to the axis of symmetry, is then vertical, and is 1/4 units to the right of the vertex. Putting this all together, I get:

vertex: (0, - 5); focus: (-1/4, - 5); axis of symmetry: y = - 5; directrix: x = 1/4

Find the vertex and focus of y2 + 6y + 12x - 15 = 0

The y part is squared, so this is a sideways parabola. I'll get the y stuff by itself on one side of the equation, and then complete the square to convert this to conics form.

y2 + 6y - 15 = - 12x

y2 + 6y + 9 - 15 = - 12x + 9

(y + 3) 2 - 15 = - 12x + 9

(y + 3) 2 = - 12x + 9 + 15 = - 12x + 24

(y + 3) 2 = - 12 (x - 2)

(y - (-3)) 2 = 4 (-3) (x - 2)

Then the vertex is at (h, k) = (2, - 3) and the value of p is - 3. Since y is squared and p is negative, then this is a sideways parabola that opens to the left. This puts the focus 3 units to the left of the vertex.

vertex: (2, - 3); focus: (-1, - 3)