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May 25th, 2015, 03:00 AM   #1
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Scalar product

Hey guys! I hope you all had a great weekend! I have a question concerning a math problem I am solving..

we have :


hebergeur d images

the question is to find :

BI . BC (vector) done

AC . ED (vector) done


Show that CA . CD (vector)= -54 without finding the value of CD,maybe replacing CD with other vector? But no matter how much I tried I couldn't arrive to the solution.. :S

I solved the first 2,in details the first one. I still need the last one..


h├ębergeur image gratuit

Thank you guys!
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May 25th, 2015, 04:31 AM   #2
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One method: $CA.CD = CA.BE = -AC.IL = -54$.
Thanks from blueberry94

Last edited by skipjack; May 25th, 2015 at 04:41 AM.
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May 25th, 2015, 04:53 AM   #3
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Thank you so much! Got it!
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