PreCalculus Day 3: Completing the Square and Circles

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In PreCalc Day 4, we cover:

Completing The Square
Definition of a Circle
Standard Form of a Circle
General Form of a Circle
Completing the Square to find the Center and Midpoint of a Circle

#PreCalculus #StandardFormOfACircle #CompletingTheSquare
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In example A: Can you please explain why "h" and "k" are both negative? Everything else in the equation was positive except subtracting 16 from each side. The negative center points has really confused me.

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