Use the dot product to find the magnitude of u if u = - 3i - 6j.

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Use the dot product to find the magnitude of u if u = - 3i - 6j.

Mathematics
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magnitude is just Sqrt[(-3)^2+(-6)^2]
Oh ok I was using the wrong equation then that would def. explain it How do you do a sqrt with negatives?
there wouldn't be negative since you are squaring them first

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uh... ok I'm confused sorry
are you trying to find the sqrt of (-3^2+-6^2) cause you can't find a sqrt with negative numbers....?

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