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If $A= <2 ,6 ,-3 >$ and $B= <-2 ,-1 ,5 >$ , what is $A*B -||A|| ||B||$ ?

1 Answer

Feb 28, 2016

$-25-7sqrt30$

Explanation:

$A.B=2*(-2)+6*(-1)+(-3)*5=-25$
$|A||B|=sqrt(2^2+6^2+(-3)^2)sqrt((-2)^2+(-1)^2+5^2)=7sqrt30$

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