### Home > A2C > Chapter 4 > Lesson 4.2.4 > Problem 4-119

4-119.

A parabola has vertex

If this parabola is a function, find its equation.

Use the equation

; if ; at . Suppose this parabola is not a function, but is a “sleeping” parabola. Find its equation.

Use the equation

; if; at .

Use the eTool below to graph the equations.

Click the link at right for the full version of the eTool: A2C 4-119 HW eTool