10.3#19

I've been working on a problem, specifically number 19. I keep getting
sqrt(78),sqrt(26). But the problem says I'm getting it wrong. I also had a
friend attempt the problem and he got the same thing as me, yet still
wrong. It is asking for the length of the diagonals using u=<-3,2> and
v=<7,4>. Any help on why it says it's wrong?

Thanks,

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Well the answers you have now are different and correct so it looks like you figured it out.