What is the center and radius of the circle with equation x2+y2−18x+18y=−137?
1 Answer
May 9, 2018
The center is (9,-9) with a radius of 5
Explanation:
Rewrite the equation:
The goal is to write it to something that looks like this:
From looking at the coefficents of
Same for
the part that is extra is
Thus:
and so we find: