b) Find the equation of the parabola with focal width 16, axis parallel to x-axis and passing through the points (3, 7) and (3,-1).​

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

you need to add a picture