Question

Evaluate the dot product of (7,5) and (-5,4).

Answer 1

ac+bd

Answer 2

oops !

Answer 3

So -15?

Answer 4

good thing @freckles i s here to keep me honest

Answer 5

someone has to

Answer 6

yes \(-15\)

Answer 7

\[\langle x_1,y_1\rangle\cdot\langle x_2,y_2\rangle = x_1x_2+y_1y_2\]

Answer 8

Thanks

Answer 9

stack them, multiply down and add across

( 7 , 5)
(-5, 4)
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-35+20