# Circles: Expanded Form

- Author:
- David

- Topic:
- Circle

## Building Background

The essential concept here is to understand how perfect squares work. Before we get to that, let's recall how the vertex form is related to the standard form of Quadratics
Suppose you have the quadratic . How is this put into standard form?
Slide the "steps" slider to see how.

## Summary

You can see the standard form of
is

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