Question

How do you find `abs( 9 - 5i )`?

Answer 1

`sqrt106`

Explanation:

Given a complex number z = x + yi , to find the magnitude of z then

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

here x = 9 and y = -5

`rArrr=sqrt(9^2+(-5)^2)=sqrt106`