Question

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

Answer 1

magnitude is just Sqrt[(-3)^2+(-6)^2]

Answer 2

Oh ok I was using the wrong equation then that would def. explain it
How do you do a sqrt with negatives?

Answer 3

there wouldn't be negative since you are squaring them first

Answer 4

uh... ok I'm confused sorry

Answer 5

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