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plz help to solve vector problem?
IF magnitude vector |a| = magnitude vector |b|, simplify (vector a + vector b). (dot) (vector a - vector b) and (vector a + vector b)^2
sorry no, i don't have any details on this, its a question from the specialist math book -question 5. c)
Heinemann VCE zone specialist mathematics exercise 1.5 question- 5 c)
3 Answers
- 1 decade agoFavorite Answer
(a+b).(a-b)
=a.a-a.b+b.a-b.b
=a.a-b.b <<as a.b=b.a>>
=|a|^2-|b|^2
(a+b)^2
=(a+b).(a+b)
=a.a+a.b+b.a+b.b
=a.a+2a.b+b.b <<a.b=b.a>>
=|a|^2+2|a||b|+|b|^2
Swamy
- 1 decade ago
Im having a hard time visualizing this. Doesnt it depend on the direction of the vector?
