Properties of the Dot Product...1

[nycmathguy]

Section 6.4

 

[MathLover1]

you made mistake at 2[-6]w, should be -12w, not -18w

 

[nycmathguy]

you made mistake at 2[-6]w, should be -12w, not -18w

Thank you for pointing out my errors.

 

[Country Boy]

The problem also said "state whether the answer is a scalar or a vector" but you did not do that.

 

[nycmathguy]

The problem also said "state whether the answer is a scalar or a vector" but you did not do that.

The result is a scalar.

 

[Country Boy]

NO, it is not! And your mistake is much worse than just -18 instead of -12.
-18< 3, -1> is NOT the scalar -18(3)+18= -36. It is the vector <-18(3), -18(-1)>= < -54, 18>.

 

[nycmathguy]

I see my error. It's a vector.