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Maths C4 Vectors HELP!

I keep getting the dot product wrong and I don't know why
I read that if you're doing the dot product both the vectors have to be entering the junction or exiting a junction (is this correct)

I can do the fist question fine but I keep getting -4 for lambda when it should be 4

Thanks for the help
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Original post by suld1951
I
I read that if you're doing the dot product both the vectors have to be entering the junction or exiting a junction (is this correct)


If you're trying to find the angle between them, then yes that's correct.


I can do the fist question fine but I keep getting -4 for lambda when it should be 4

Thanks for the help


Post your working then.
Reply 2
Avatar for metrize
metrize
18
Just dot AB and BC (in terms of equation of r) and set theta equal to 90

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