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Math Help - urgent help please

  1. #1
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    urgent help please

    find the radius and center of
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  2. #2
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    Quote Originally Posted by ea12345 View Post
    find the radius and center of
    The general equation of a circle of radius r and centre at (h, k) is (x - h)^2 + (y - k)^2 = r^2.
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  3. #3
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    urgent help

    actual equation is
    Attached Thumbnails Attached Thumbnails urgent help please-eq.bmp  
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  4. #4
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    Quote Originally Posted by ea12345 View Post
    actual equation is
    Complete the square:

    (x + 4)^2 - 16 + 8 + y^2 = 0 \Rightarrow (x + 4)^2 + y^2 = 8.

    Now read again my first post.
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  5. #5
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    x2 + y2 + 8x + 8 = 0
    x2 + 8x + (4)2 + (y 0)2 = -8 + x2
    (x + 4)2 + (y 0)2 = 8
    (x (-4) )2 +(y 0)2 =( )
    (x (-x) )2 + (y 0) = (2 )
    SO, centre is (-4 , 0) and radius is 2





    its true or not ?
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  6. #6
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    Quote Originally Posted by ea12345 View Post
    x2 + y2 + 8x + 8 = 0
    x2 + 8x + (4)2 + (y 0)2 = -8 + x2
    (x + 4)2 + (y 0)2 = 8
    (x (-4) )2 +(y 0)2 =( )
    (x (-x) )2 + (y 0) = (2 )
    SO, centre is (-4 , 0) and radius is 2





    its true or not ?
    The radius is not 2.
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  7. #7
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    then
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