Class 12 Vector Algebra · Mcq Single Correct1 Marksvector_identities
Class 12 Maths · Vector Algebra · Mcq Single Correct #87
Let a=(1,−2,3), a·b=|b|² and |a−b|=√7. Find |b|.
✅ Step-by-Step Solution
Final Answer: Option (C): √7
- 7=|a−b|²=14+|b|²−2|b|²=14−|b|², so |b|²=7.
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