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 May 25th, 2015, 03:00 AM #1 Newbie   Joined: Oct 2012 Posts: 6 Thanks: 0 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.. hébergeur image gratuit Thank you guys!
 May 25th, 2015, 04:31 AM #2 Global Moderator   Joined: Dec 2006 Posts: 20,939 Thanks: 2210 One method: $CA.CD = CA.BE = -AC.IL = -54$. Thanks from blueberry94 Last edited by skipjack; May 25th, 2015 at 04:41 AM.
 May 25th, 2015, 04:53 AM #3 Newbie   Joined: Oct 2012 Posts: 6 Thanks: 0 Thank you so much! Got it!

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