Answer:
Im sosorry my internet is so poor sorry.
we have

Group terms that contain the same variable, and move the constant to the opposite side of the equation

Factor the leading coefficient
----------> the value of A is 
Complete the square. Remember to balance the equation by adding the same constants to each side


Rewrite as perfect squares


therefore
the answer is
the value of A is 
Sorry my answer was wrong so I just edited it sorry
Answer:
-2 I think hopefully that is right