Which of the following represents the distance between -8 and 4 on a number line?​

You would put an open dot on both ends from -8 to 4 or just a distance of 12

Step-by-step explanation:

none of the above.

for one of the equations to be used in the process, there has to be a term in the equation since squared is .

since there is only a term in the first equation, we cannot derive a from completing the square.

solving with completing the square