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Math Help - Finding equations for cirlcles

  1. #1
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    Finding equations for cirlcles

    Practice Find the equation in general form of the circle with the given properties.
    Center at (-3, 4); r = 5√5
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  2. #2
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    The general equation for a circle is:

    (x-a)^2+(y-b)^2=r^2

    Where (a,b) is the centre of the circle and r is the radius.

    Just plug and play!
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  3. #3
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    so I got the answer:
    x^2+y^2+6x-8y-109=0
    It counted it incorrect, what did I do wrong?
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  4. #4
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    You're almost there! I get a different constant (ie not -109).
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  5. #5
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    Im confused...cause aren't you supposed to subtract the 125 from -16?
    or I must be adding or subtracting something wrong right...
    I got -125?
    does that sound better?
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