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Grade 12Vectors

Could you please help me by answering this question elaborately.....

Question image for Could you please help me by answering this questi
Profile image of Adhi Narayana Prabhu Dev
6 Years agoGrade 12
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2 Answers

Profile image of Arun
ApprovedApproved Tutor Answer6 Years ago
Dear student
 
it is (a.b + a.c ) x (a + 2b + 3c)
 
 = (a.b) x a + (a.b) x 2b + (a.b) x 3c + (a.c) x a + (a.c) x 2b + (a.c) x 3c
 
 = 0 + 0 + 3 [ a b c] + 0  – 2 [ a b c] + 0
 
 = [ a b c]
 
Hope it helps
Profile image of Vikas TU
ApprovedApproved Tutor Answer6 Years ago
Dear student 
a.{ b× a + 2 b×b + 3 b×c + c×a + 2c×b + 3 c×c)
a.{ b×a + 3 b×c + c× a - 2 b×c )
a. ( b× a + c× a + b× c)
a.( b×a) + a.( c×a) + a.( b×c)
As a.( b×a) and a.( c×a) =0
So a .( b×c) = [ a b c]
Good Luck 

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