Vectors c4

Need help on question below, wrote the question with part b out on top of page

ImageUploadedByStudent Room1398954923.427669.jpg

My working is shown, but where did I go wrong? It's impossible to have cosx=6/5!

Thanks!

Posted from TSR Mobile

Need help on question below, wrote the question with part b out on top of page

ImageUploadedByStudent Room1398954923.427669.jpg

My working is shown, but where did I go wrong? It's impossible to have cosx=6/5!

Thanks!

Posted from TSR Mobile

Your scalar product is incorrect, there is no 5 on the numerator since

5\times 0 = 0

Original post by Masiemaths

Your scalar product is incorrect, there is no 5 on the numerator since

5\times 0 = 0

Wow, haha didn't see that! I now get cosx = 0.7 which seems correct. Thanks! :biggrin:

LaTex

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