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junior college 1 | H2 Maths
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angelina
Angelina

junior college 1 chevron_right H2 Maths chevron_right Singapore

I'm confused on which multiplication to use scaler or vector???

Date Posted: 4 months ago
Views: 31

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Eric Nicholas K
Eric Nicholas K's answer
2911 answers (Tutor Details)
The vector projection of 3a - b onto a - 3b is the one I labelled in red on the left hand side.

But the length of that projection is a scalar (length is a scalar, independent of the direction). So using the scalar projection formula is sufficient for this question.
Eric Nicholas K
Eric Nicholas K
4 months ago
I mean the one I labelled in red without the arrow. The one which I wrote 'length of projection'.

Also, cos 60 = half.
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Tan Y J
Tan Y J's answer
14 answers (A Helpful Person)
1st
I have no idea how to calculate modulus part so I am guessing here. I only know how to do first part. Sorry.