Find the value of 'p' so that x2+y2+8x+10y+p=0 is the equation of circle whose radius is 7

Comparing it with x2+y2+2gx+2fy+c=0 g = 4, f = 5, c = p Now radius = g2+f2-c= 7 16+25-p =7 41-p=49p = -8 

  • 4
-8
  • -5
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