Last updated at May 6, 2021 by Teachoo

Transcript

Example 22 Find |๐ โ ร ๐ โ|, if ๐ โ = 2๐ ฬ + ๐ ฬ + 3๐ ฬ and ๐ โ = 3๐ ฬ + 5๐ ฬ โ 2๐ ฬ Given ๐ โ = 2๐ ฬ + ๐ ฬ + 3๐ ฬ ๐ โ = 3๐ ฬ + 5๐ ฬ โ 2๐ ฬ Now, ๐ โ ร ๐ โ = |โ 8(๐ ฬ&๐ ฬ&๐ ฬ@2&1&3@3&5&โ2)| = ๐ ฬ (1 ร (-2) โ 5 ร 3) โ ๐ ฬ (2 ร (-2) โ 3 ร 3) + ๐ ฬ (2 ร 5 โ 3 ร 1) = ๐ ฬ (โ2 โ15) โ ๐ ฬ (โ4 โ9) + ๐ ฬ (10 โ 3) = โ17๐ ฬ + 13๐ ฬ + 7๐ ฬ So, Magnitude of ๐ โ ร ๐ โ = โ((โ17)2+(13)2+(7)2) |๐ โ" ร " ๐ โ | = โ(289+169+49) = โ507 Thus, |๐ โ" ร " ๐ โ | = โ๐๐๐

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Example 26 (Supplementary NCERT) Deleted for CBSE Board 2022 Exams

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.