Question

Evaluate the dot product of (2,4) and (1,-2)

Answer 1

\[(a,b)\cdot (c,d)=ac+bd\]

Answer 2

-6?

Answer 3

yes

Answer 4

So would these two vectors be orthogonal?

Answer 5

they are orthogonal if and only if the dot product is zero

Answer 6

So since it's -6 they aren't orthogonal?

Answer 7

correct

Answer 8

Thank you so much!

Answer 9

np