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The graph of x 2 − 2x + y 2 + 10y = 0 is a circle. Find the radius of this circle.

 Feb 22, 2021
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x^2  - 2x + y^2  + 10y    =  0   complete the square  on x , y

 

x^2  - 2x  + 1   +  y^2  + 10y + 25 =   1  + 25

 

(x - 1)^2  +  ( y + 5)^2  = 26

 

26  = r^2

 

sqrt (26)   = r

 

cool cool cool

 Feb 22, 2021

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