(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

In the diagram ABCD is a square, P and Q are the midpoints of DC and BC respectively. Show that PA + QA = 1.5 CA

check attachment for diagram

2. Relevant equations

none (i think?)

3. The attempt at a solution

PA+QA=3/2 CA

=PC+CA+QC+CA

=PA+AC+QC+2CA

=PA+AC+QA+AC+2AC

=PA+QA+4AC

and I'm stuck here. I also would like to know if there is a difference between prove

and show

Secondly is anyone could give some tips how to deal with these problems with proofs (also in trigonometry) it would be greatly appreciated. I am pretty much running through the dark with these problems.

P.S I don't know how to get the little arrows above the letters to show they are vectors, if anyone could tell me how...

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# Homework Help: Hopelessly confused with vectors

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