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OpenStudy (anonymous):
Use the dot product to find the magnitude of u if u = - 3i - 6j.
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OpenStudy (anonymous):
magnitude is just Sqrt[(-3)^2+(-6)^2]
OpenStudy (anonymous):
Oh ok I was using the wrong equation then that would def. explain it How do you do a sqrt with negatives?
OpenStudy (anonymous):
there wouldn't be negative since you are squaring them first
OpenStudy (anonymous):
uh... ok I'm confused sorry
OpenStudy (anonymous):
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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