Answer:
(A)
Step-by-step explanation:
The standard form of the equation of a circle is given as:

Simplifying the above given equation, we get




which is the required general form of the equation.
Hence, option A is correct.
Answer: five
Step-by-step explanation:
Your doing everything correctly
K=8k+28
subtract 8k from both side
-7k = 28
divide both side by -7
k= -4