Question

How do you find `abs( 12-5i)`?

Answer 1

`|12-5i|=13`

Explanation:

`|12-5i|` is the modulus of complex number `12-5i`.

Modulus of complex number `a+bi` is given by `sqrt(a^2+b^2)`

hence `|12-5i|=sqrt(12^2+(-5)^2)=sqrt(144+25)=sqrt169=13`