What will be the java expression

Question

What will be java expression of
|x²+2xy|

Answer 1

| | --> Maths.abs()
x^2 --> Math.pow(x,2)

int a = (int) Math.pow(x,2);
int b = (int)Math.abs(a + 2*x*y);

Answer 2

Why | | used as Math. Abs()