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Mathematics 11 Online
OpenStudy (anonymous):

what is the standard form equation of the cirlce, x^2+y^2-4x+6y+9=0

OpenStudy (phi):

do you know how to complete the square for x^2 -4x ? and for y^2 +6y ?

OpenStudy (anonymous):

no

OpenStudy (phi):

See this http://www.khanacademy.org/math/algebra/quadratics/completing_the_square/v/completing-the-square It is the major step to doing your problem.

OpenStudy (anonymous):

i just need the answer very quickly

OpenStudy (phi):

Then learn how to "complete the square" quickly

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