The Basics

Below is important terminology for vertex form of parabolas!

Vertex

The maximum of minimum point of the parabola. It is the point where the graph changes direction.


How do I Label this?

Use the vertex's coordinates! (x,y)

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Optimal Value (Max. / Min. Value)

The vertex's height of the parabola. This is your y coordinate of your vertex!

The Maximum value is the highest point of the parabola while the minimum value is the lowest of the parabola. If the parabola has a max value, it will open downwards. If it has a min value, it will open upwards.

(x,y)

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Axis of Symmetry

Where the parabola is divided into half equally. This is your x coordinate of your vertex!


(x,y)


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Y- intercept

Where the parabola crosses the y - axis


How do I Label it?

Set your x at 0 and plug in the y value

(0,__)

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X- intercept / Zeroes

Where the parabola crosses the x - axis


How do I Label it?

Set your y at 0 and plug in the x value

(__, 0)