Question

How do you find `abs(-1 - 2i)`?

Answer 1

`|-1-2i|=sqrt5`

Explanation:

Let `z=x+iy` be any complex number in rectangular form.

Then the modulus may be given by `|z|=sqrt(x^2+y^2)`.

So in this particular case we get:

`|-1-2i|=sqrt((-1)^2+(-2)^2)=sqrt5`.