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rohan bhatia Grade: 11
        

sir pls solve ths qutn





if the point (A,-A) lies inside the circle x+y-4x+2y-8=0, then find the range of A.


7 years ago

Answers : (1)

Badiuddin askIITians.ismu Expert
147 Points
										

Dear rohan


i think equation of circle is x2+y2-4x+2y-8=0


 center of circle (2,-2)  and radius =4


so for point(a-a) lie on the circle radius must be greater then distance between (a,-a) and (2,-2)


4> √(a-2)2 +(-a+2)2


4> |(a-2)|√2


2√2> |a-2|


 2-2√2  <a<2+2√2





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Badiuddin

7 years ago
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