If $\|u\|=2, \|v\|=2$ and $u⋅v=3$, find $\|u+2v\|$

Question

If $\|u\|=2, \|v\|=2$ and $u⋅v=3$, find $\|u+2v\|$, give your answer in $2$ decimal places. I can't seem to find $\|u+2v\|$ no matter what I do.