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Grade 12Vectors

prove that(vector A+2B vector).(2Avector- 3B vector) equal to???

Profile image of NAVDEET HANSDA
8 Years agoGrade 12
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1 Answer

Profile image of sonika p
8 Years ago
(A+2B).(2A-3B) 
= 2|A|^2 + 4(B.A)-3(A.B)-6|B|^2
Since, for dot product,  A.B = B.A
= 2|A|^2 + (A.B)-6|B|^2
 

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