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Mathematics, 03.11.2019 12:31 anglacx5465

What are the center and radius of a circle defined by the equation x^2+y^2- 6x+ 8y+ 21=0?
a. center (3,-4); radius 4
b. center (3,-4); radius 2
c. center (-3,4); radius 2
d. center (-3,4); radius 4

me quick!

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What are the center and radius of a circle defined by the equation x^2+y^2- 6x+ 8y+ 21=0?
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