Expanded Form: Complete the Square
Working Backwards
Suppose you have the equation of the circle .
It's clear this is not in standard form.
How can you place it in standard form?
Complete the Square
How does it work?
Recall that a perfect square looks like
1.
or
2.
and when foiled out:
1.
or
2.
Note the and the .
In General: if you have , the value that completes the square is .
Now complete the Complete the Square Khan Missions. 2 right in a row