Question

How do you find `abs(7-9i)`?

Answer 1

`|7-9i|=sqrt130`

Explanation:

Absolute value of a complex number `a+ib` is denoted as `|a+ib|`

and is given by `sqrt(a^2+b^2)`

Hence absolute value `|7-9i|` is

`sqrt(7^2+9^2)=sqrt(49+81)=sqrt130`