What is the radius of a circle defined by 2x^(2)+2y^(2)+4x-12y-30=0?

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What is the radius of a circle defined by 2x^(2)+2y^(2)+4x-12y-30=0?

Mathematics
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x^2 +2x + y^2 - 6y = 15
by diving by 3, and rearranging
x^2 +2x + 1 +y^2 -6y + 9 = 15 + 1 + 9

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Other answers:

(x+1)^2 +(y-3)^2 = 25 therefore radius is sqrt25 = 5
mean by dividing by 2
Same type of question, just a bit more complex: Find the axes and the centre of this curve: 9x^2-4xy+6y^2=10
do you know how to do this?
ahh no
i know its from conic sections
I think it can be done somehow with matrices
but I am not that strong with matrix algebra
nah i definately havent seen something like that

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