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