Geometry

Question Analysis:
This involves using diagonal equality in a square.
The main focus is solving for a variable using geometric constraints.

Key Concept Explanation:
Diagonals in a square are equal in length.

Step-by-Step Solution:
Set x + 5 = 2x + 1
→ 4 = x

Common Mistakes:
Forgetting to isolate x
Assuming unequal diagonals ...