Question

What is |1 − 8i|?
A. 65
B. √13
C. √-65
D. √65

Answer 1

Hey There !

|1-8i| is in the form of |a+bi| = √a^2+b^2

So now ,

a = 1 b=-8

=> √1^2+(-8)^2

=> √1+64

=> √65

Hence option D is correct

Hope this helps you!:)