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Find the radius of the circle given by x^2-10x+y^2+8y=18

 Jun 27, 2020
 #1
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Put it into standard form  of    (x-h)^2 + (y-k)^2 = r^2

 

complete the square for x  and y

 

(x-5)^2      +  (y+4)^2    = 18  +25      + 16

(x-5)^2      +  (y+4)^2    =   59                       soooooo:    59 = r^2      find   'r' 

 Jun 27, 2020

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