Question

What is the absolute value of the number?
3 + i

Answer 1

Find d.

Answer 2

\(\large d = |3+i|\)

Answer 3

Can you solve it from here?

Answer 4

the | | means the "length" or magnitude of the complex number.
use pythagorean theorem (see geerky's picture)
you know the x length and y length, so you can find d.