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For what value of c will the circle with equation x^2 - 10x + y^2 + 8y + c = 0  have a radius of length 1?

 Oct 28, 2020
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Put in standard circle equation form    (x-h)^2 + (y-k)^2 = r^2

 

(x-5)^2      + (y+4)^2  =   - c  +25 + 16

 

      so    - c + 25 + 16 = 1^2

               -c = 1 -25-16

                 c = 40

 Oct 28, 2020

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