SOLUTION: Will someone PLEASE HELP!!! write an equation for the circle with center (-4, sq. root 7) and radius of 5 units. I have to whow my work. PLEASE HELP!!! Thanks

Algebra ->  Circles -> SOLUTION: Will someone PLEASE HELP!!! write an equation for the circle with center (-4, sq. root 7) and radius of 5 units. I have to whow my work. PLEASE HELP!!! Thanks      Log On


   

Question 167395: Will someone PLEASE HELP!!!
write an equation for the circle with center (-4, sq. root 7) and radius of 5 units.
I have to whow my work.
PLEASE HELP!!!
Thanks
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Will someone PLEASE HELP!!!
write an equation for the circle with center (-4, sq. root 7) and radius of 5 units.
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The general eqn of a circle is:
%28x-a%29%5E2+%2B+%28y-b%29%5E2+=+r%5E2 where the center is at (a,b) and the radius is r.
For the one you entered, it's
%28x%2B4%29%5E2+%2B+%28y-sqrt%287%29%29%5E2+=+25
That can be manipulated and shown as:
x%5E2+%2B+8x+%2B+16+%2B+y%5E2+-2y%2Asqrt%287%29+%2B+7+=+25
x%5E2+%2B+y%5E2+%2B+8x+-%282sqrt%287%29%29y+=+2