Question

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

Answer 1

\[magnitude = \sqrt{6^{2}+(-3^{2})}\]

Answer 2

I solved that and I got sqrt of 45..which is not one of my answers

Answer 3

i mean its not one of my choices

Answer 4

what are your choices?

Answer 5

18, 4sqrt 5, 3, 23, 3sqrt 5

Answer 6

√45 = 3√5

Answer 7

\[\sqrt{45} =\sqrt{9\times5}=\sqrt{9}\times \sqrt{5}=3\sqrt{5}\]

Answer 8

thank you!