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Vector Product

How would I simplify:

A x (B + C) B

My working is:

= (A x B + A x C) B
= (A x B B) + (A x C B)

Where do I go from here?

The answer is meant to be:

A x C B


Posted from TSR Mobile
(edited 10 years ago)
Reply 1
Original post by SherlockHolmes
How would I simplify:

A x (B + C) B

My working is:

= (A x B + A x C) B
= (A x B B) + (A x C B)

Where do I go from here?

The answer is meant to be:

A x C B


Posted from TSR Mobile


A x B is __________ to B.

The dot product of ________ vectors is __.
Original post by BabyMaths
A x B is __________ to B.

The dot product of ________ vectors is __.


A x B is parallel to B?

The dot product of parallel vectors is 0?

Why is 'The dot product of parallel vectors is 0' true?



Posted from TSR Mobile
Reply 3
Original post by SherlockHolmes
A x B is parallel to B?

The dot product of parallel vectors is 0?

Why is 'The dot product of parallel vectors is 0' true?



Posted from TSR Mobile


No.

No.

It isn't true.

Did you just guess? You're on the internet. Guessing is not necessary.
Original post by BabyMaths
No.

No.

It isn't true.

Did you just guess? You're on the internet. Guessing is not necessary.


No I did not guess... I was thinking of the 'x' as multiply rather than cross product hence I thought A x B was a multiple of B and came to the conclusion that the dot product of two parallel vectors is 0 and was confused.

I will correct my statements:

A x B is perpendicular to B.

The dot product of perpendicular vectors is 0.

Posted from TSR Mobile
(edited 10 years ago)
Original post by SherlockHolmes
No I did not guess... I was thinking of the 'x' as multiply rather than cross product hence I thought A x B was a multiple of B and came to the conclusion that the dot product of two parallel vectors is 0 and was confused.

I will correct my statements:

A x B is perpendicular to B.

The dot product of perpendicular vectors is 0.

Posted from TSR Mobile


Now you are correct.

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