Question

The dot product of u ∙ u = 45 what is the length of u?

Answer 1

Answer:

67 hah why you solve this

Answer 2

$\textbf{u} \cdot \textbf{u} = 45\\\\\implies |\textbf{u}|^2 =45\\\\\implies |\textbf{u}| = 3\sqrt{5}$