Physics
General
Easy

Question

A and straight B with rightwards arrow on top are nonzero vectors. Which from the followings is true?

  1. vertical line A with not stretchy rightwards arrow on top plus B with not stretchy bar on top vertical line squared minus vertical line A with not stretchy rightwards arrow on top minus B with not stretchy bar on top vertical line squared equals 2 open parentheses A squared plus B squared close parentheses
  2. vertical line A with not stretchy rightwards arrow on top plus B with not stretchy rightwards arrow on top vertical line squared minus vertical line A with not stretchy rightwards arrow on top minus B with not stretchy rightwards arrow on top vertical line squared equals 2 open parentheses A squared minus B squared close parentheses
  3. vertical line A with not stretchy rightwards arrow on top plus B with not stretchy bar on top vertical line squared minus vertical line A with not stretchy rightwards arrow on top minus B with not stretchy rightwards arrow on top vertical line squared equals A squared plus B squared
  4. vertical line A with not stretchy rightwards arrow on top plus B with not stretchy rightwards arrow on top vertical line squared minus vertical line A with not stretchy bar on top minus B with not stretchy bar on top vertical line squared equals A squared minus B squared

The correct answer is: vertical line A with not stretchy rightwards arrow on top plus B with not stretchy bar on top vertical line squared minus vertical line A with not stretchy rightwards arrow on top minus B with not stretchy bar on top vertical line squared equals 2 open parentheses A squared plus B squared close parentheses

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