If a → = 2 i ^ + j ^ + 3 k ^ , b → = i ^ + 3 j ^ - k ^ and c → = 3 i ^ - j ^ - 2 k ^ then,…

If a=2i^+j^+3k^,b=i^+3j^-k^ and c=3i^-j^-2k^ then, the value of a·aa·ba·cb·ab·bb·cc·ac·bc·c is
  1. 2020
  2. 2025
  3. 2030
  4. 1849

Solution

Given that, If a=2i^+j^+3k^,b=i^+3j^-k^ and c=3i^-j^-2k^ 

a·a=14, b·b=11, c·c=14 and a·b=b·a=2, a·c=c·a=-1, b·c=c·b=2

Putting these values in a·aa·ba·cb·ab·bb·cc·ac·bc·c, we get 142-12112-1214

=14154-4-228+2-14+11

=2025

Asked in: AP EAMCET 2021 (19 Aug Shift 1)

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