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What is the general form of the equation of a circle with center at (a, b) and radius of length m?

x2 + y2 − 2ax − 2by + (a2 + b2 − m2) = 0

x2 + y2 + 2ax + 2by + (a2 + b2 − m2) = 0

x2 + y2 − 2ax − 2by + (a + b − m2) = 0

x2 + y2 + 2ax + 2by + a2 + b2 = -m2

Question

help me please fans and medal awarded!!!
What is the general form of the equation of a circle with center at (a, b) and radius of length m?

x2 + y2 − 2ax − 2by + (a2 + b2 − m2) = 0 

x2 + y2 + 2ax + 2by + (a2 + b2 − m2) = 0

x2 + y2 − 2ax − 2by + (a + b − m2) = 0

x2 + y2 + 2ax + 2by + a2 + b2 = -m2

anonymous · Answer

http://www.regentsprep.org/regents/math/algtrig/ATC1/circlelesson.htm instead of answering directly check this out and get the correct one,,,