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Find the radius of the circle with equation x^2 - 4x + y^2 - 6y - 36 = 25

 Jul 7, 2022
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x^2 - 4x + y^2 - 6y - 36 = 25       

 

x^2 - 4x + y^2 -6y  = 25 + 36       complete the square on x, y

 

x^2 - 4x + 4 + y^2 - 6y + 9  = 25 + 36 + 4 + 9

 

25 + 36 + 4 + 9 =  r^2

 

74   = r^2

 

sqrt (74 )   = r

 

 

cool cool cool

 Jul 7, 2022

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