Why Does A Become |A| in Normalizing Ψ Homework?

[jinksys]

Homework Statement

I am doing part (A).

Homework Equations

The Attempt at a Solution

When solving the problem, A^2 is pulled out of the integral and becomes |A|^2. Why does A become |A|?

 

[vela]

The normalization constant can, in general, be complex, so when you square the modulus of the wave function, you'd get |A|² instead of simply A². The problem here, however, states that A is real, so you could just use A².