2-2

If you meant the arithmetic expression: 2 − 2 = 0.

If you meant something else (e.g., problem 2-2 on a worksheet, or Section 2.2 of a course), please share the exact statement or topic and I’ll help with a full solution or a summary. If you’re unsure, tell me your course (calculus, algebra, linear algebra, statistics, etc.) and I can outline what Section 2.2 typically covers and what to study.