Question

Find 2u. v, if u = (-3,6) and v=i+2j.
30
18
15
9

Answer 1

`u= < -3~~,~~6 > \hspace{9em}v=i+2j\implies v= < 1~~,~~2 > \\\\[-0.35em] ~\dotfill\\\\ 2u\implies 2 < -3~~,~~6 > \implies < (2)(-3)~~,~~(2)(6) > \implies < -6~~,~~12 > \\\\\\ 2u\cdot v\implies\stackrel{ \textit{\LARGE dot product} }{ < -6,12 > \cdot < 1,2 > }\implies (-6)(1)+(12)(2)\implies \text{\LARGE 18}`

Answer 2

dot product practice

1. 88

2. 5

3. llull=sqrt (sqrt 45)

4.18

Explanation:
missed some but these are the correct ones you’re welcome and have a nice day