Question 399953
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Hi
completing the square
 x^2+10x-3=0
  x^2+10x    -3 = 0
(x+5)^2 -25  -3 = 0    |Note:(x+5)^2 = 'x^2 + 10x' + 25 (Thus the -25)
  (x+5)^2 -28 = 0