The vectors a and b are the two vectors drawn from a vertex of a square to the two adjacent vertices. Express in terms of a and b the vector of the diagonal drawn from the same vertex.

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    $\begingroup$ Between this and your prior question it really looks like you are just posting your homework here for us to do for you. Please edit your post to explain what you have tried and where you are getting stuck. $\endgroup$ – lulu Apr 21 at 18:28
  • $\begingroup$ sorry lulu but it is not my homework it is a test to join an university and i did not study that in high school that s it $\endgroup$ – Ischool Med5 Apr 21 at 18:32
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    $\begingroup$ I suggest looking up addition of vectors....there are plenty of online resources for that sort of thing. $\endgroup$ – lulu Apr 21 at 18:36
  • $\begingroup$ thank you so much and by the way Istudy in french so I have a lot of problems to know which cours is it $\endgroup$ – Ischool Med5 Apr 21 at 18:38
  • $\begingroup$ The fact that you study in French is by NO means an impediment! Some of the best mathematicians were (and still are!) French! $\endgroup$ – Sharat V Chandrasekhar Apr 22 at 1:06

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