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solve by completing the square b^2 + 6b - 16 = 0

Sagot :

               b² + 6b - 16 = 0
        b² + 8b - 2b - 16 = 0
b(b) + b(8) - 2(b) - 2(8) = 0
       b(b + 8) - 2(b + 8) = 0
                (b - 2)(b + 8) = 0
b - 2 = 0      or     b + 8 = 0
   + 2 + 2                  - 8 - 8
     b = 2                    b = -8