The angle between two vectors u=i-3j and v=ai+5j is 120°. Find a correct to 1 decimal place.
I've tried substituting into the scalar equation but I can't get the answer
I worked it out, and my answers are 24.4 and -4.4. However, the text book says 4.4 or -24.4. Why is that?What do you end up with in your working?
You should probably show us the steps in your working, in order for us to be able to answer that.I worked it out, and my answers are 24.4 and -4.4. However, the text book says 4.4 or -24.4. Why is that?
You should probably show us the steps in your working, in order for us to be able to answer that.
I'm also stuck on this one:
Find vector b given a = 3i - j, a•b = -6 , and the angle between a and b is 30°.