-------- Subtracting 7 from both sides

 ----- Dividing by 3 to make the leading coefficient, 1 



  ------ Completing the square on x







 (CHOICE E) 

Answer by ikleyn(52781)   (Show Source): You can put this solution on YOUR website!
 .

I only want to add that THERE IS NO real number x, satisfying the given equation and satisfying this equality 


 = .    (*)


It can be true for complex numbers ONLY.


How did I reveal it ?  - Look in this equality (*): the square of a number in the left side is equal to negative number in the right side.


There is nothing bad in it; you only need to understand it that there is no such real number.




----------------

Also,  on completing the square see the lesson



    - HOW TO complete the square - Learning by examples 



in this site.





 

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