Hi

z^2-5z-6=0    |Note the use of ^ (uppercase 6)

   az^2 + bz + c = 0



   

     z = 12/2 = 6  OR z =-2/2 = -1



CHECKING our Answer(s)***

  36-32-6 = 0        when z = 6

  1 -5*-1 - 6 = 0    when z = -1 

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