Last updated at May 29, 2018 by Teachoo

Transcript

Example 17Find | | , if two vectors a and b are such that | | = 2, | | = 3 and = 4. Given, | | = 2 , | | = 2 & . = 4 We need to find : | | Taking square, | |2 = ( ). ( ) = . . . + . = . . . + . = . 2 . + . = | |2 2 . + | |2 = 22 2 4 + 32 = 4 8 + 9 = 5 So, | |2 = 5 | | = 5 Since magnitude is not negative, So, | | =

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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 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.