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Find the radius of the circle given by x2-10x+y2+8y=18. Round to 1 decimal place

Deathstroke_rule  Mar 6, 2017

Best Answer 

 #2
avatar+75332 
+11

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)  ≈ 7.7 units

 

 

cool cool cool

CPhill  Mar 6, 2017
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1+0 Answers

 #2
avatar+75332 
+11
Best Answer

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)  ≈ 7.7 units

 

 

cool cool cool

CPhill  Mar 6, 2017

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