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

 Jun 21, 2022
 #1
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x^2 -10x + y^2 + 8y =  18       complete the square on x, y

 

x^2 -10x + 25  + y^2 + 8y + 16    = 18 + 25 + 16

 

(x - 5)^2   + (y + 4)^2  = 59

 

The radius  =   sqrt (59)  units

 

 

cool cool cool

 Jun 21, 2022
 #2
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WAIT HOW IS THAT POSSIBLE. I  got 56 because I got 18+ 25 + 13

 Jun 21, 2022
 #3
avatar+124676 
0

We're adding 18 + 25 + 16 =   59

 

The radius =  sqrt (59)

 

 

cool cool cool

CPhill  Jun 21, 2022

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