81+(r-4)^2=r^2

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Solution for 81+(r-4)^2=r^2 equation: 



81+(r-4)^2=r^2

We move all terms to the left:

81+(r-4)^2-(r^2)=0

determiningTheFunctionDomain
-r^2+(r-4)^2+81=0

We add all the numbers together, and all the variables

-1r^2+(r-4)^2+81=0

We move all terms containing r to the left, all other terms to the right

-1r^2+(r-4)^2=-81

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