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If | a |= 2 ,| b |= 3 and | a + b |= 6 , then what is | a - b | equal to?

Options

  1. A1
  2. B2
  3. C3
  4. D4

Correct answer

B. 2

Step-by-step solution

aligned & | a + b |^2+| a - b |^2=2 (| a |^2+| b |^2 ) & 6+| a - b |^2=2(2+3) & | a - b |=2 aligned

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