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Verified Answer :

Edufirst
  1. Completing saquares permits to extract square root fo find the solutions.

    This is the general equation when you complete the squares:

    A(x-h)^2 + k = 0

    Then you can obtain [x - h]^2 = - K/A and now you can extract square root in both sides.

    2) If k and A have the same sigh, then - K/A is negative and the square root has not real solutions, i.e. the solution will be complex.


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