Question

Find the angle theta between the vectors.

v = 4i - j + k , w= 2i +3j + 5k

Answer 1

plz do not give me the answer just point me in the right direciton

Answer 2

Use the property that \(A\cdot B=|A||B|\cos(\theta)\)

Answer 3

that is exactly what im doing and i keep getting 53.89 degrees which is incorrect.

Answer 4

I got 10 for the dot product. Is that what y'all got too?

Answer 5

\[ \large v\cdot w=10 \]
\[ \large v\cdot v=18\Rightarrow |v|=\sqrt{18} \]
\[ \large w\cdot w=38\Rightarrow|w|=\sqrt{38} \]
right?

Answer 6

well @m.auld64 ??