Algebra II
Exponential Decay
Coming soon...
Graphing Exponential Functions
Coming soon...
Exponential Growth
Coming soon...
Equation of a Circle
Every circle can be written as an equation in the form:
$(x-h)^2+(y-k)^2=r^2$
in which the coordinate $(h,k)$ is the center of the circle and $r$ is the radius of the circle. Any point $(x,y)$ that makes the equation true is on the circle.
When you are given the equation of a circle, you can pull a lot of information from that equation, and even draw the circle based on the information that you pull out.
Example:
$(x-3)^2+(y-2)^2=16$
Looking at this equation, you know that the center of the circle is $(3,2)$.