Class 12 Vector Algebra · Conceptual Answer1 Marksvector_identities
Class 12 Maths · Vector Algebra · Conceptual Answer #38
Given |a| = 4, |b| = 3 and a · b = 6√3, find |a × b|.
✅ Step-by-Step Solution
Final Answer: 6.
- By Lagrange’s identity, |a × b|² = 4²·3² − (6√3)² = 36; take the nonnegative square root.
- 6.
📋 CBSE Stepwise Marking Scheme
- [0.5 marks] By Lagrange’s identity, |a × b|² = 4²·3² − (6√3)² = 36; take the nonnegative square root.
- [0.5 marks] 6.
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