CAPE Pure Mathematics Unit 1 · 2008 (Rest of Region) · Paper 1 · Question Q5

If |x + b| = |x|; x, b \in \mathbb{N}, then the value of x in terms of b is

1. (A)-b
2. (B)-\frac{b}{2}
3. (C)\sqrt{b}
4. (D)\frac{b}{2}