Question

How do you find `abs(0 - 4i )`?

Answer 1

4

Explanation:

Given a complex number x + iy , then it's magnitude is found
using ' Pythagoras' theorem' , as follows.

| x + iy | = `sqrt(x^2 + y^2)`

`rArr |0 - 4i | = sqrt(0^2 + (-4)^2) = sqrt16 = 4`