How do you plot #-4+4i# and find its absolute value?
In the Argand plane, the real axis is the x-axis and the imaginary axis is the y-axis. Do you get the point?
For its absolute value,
Which is the distance of this point in the Argand plane from the origin.
for calculating the absolute value of any imaginary point Z = x+iy,
Use the above concepts and find the absolute value of the above imaginary point on your own.