Hi

x^2 - 8x - 20 = 0   |Completing the square

(x-4)^2 -16 - 20 = 0  |Note:(x-4)^2 -16 = (x^2-8x+16) -16 = x^2-8x

  (x-4)^2 = 36

  (x-4) = ± 6

   x-4 = 6

     x = 10

   x-4 = -6

     x = -2 

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