Absolute Value 8 + -5i and 3 + -7i

a = bi = <-- Enter a and bi piece
c = di = <-- Enter c and di piece (not needed for square root or absolute value or conjugate)

Evaluate the absolute value of the complex number |8 - 5i|

The absolute value of a complex number is the distance from 0 to that number on the imaginary plane
|a + bi| = √a2 + b2
Given a = 8 and b = -5, we have:
|8 - 5i| = √a2 + b2
|8 - 5i| = √82 + -52
|8 - 5i| = √64 + 25
|8 - 5i| = √89
|8 - 5i| = 9.6