Hi

Solving the equation by completing the square.

y^2 +2y = 0

 (y+1)^2 - 1 = 0

  (y+1)^2 = 1  |Taking the square root of both sides of the EQ

   y + 1 = ± 1

    y = -1 ± 1

  y = 0 and y = -2



CHECKING our Answers***

   0 + 0 = 0

 4 + 2*-2 = 0 

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