Answer
$0$
Work Step by Step
Our aims is to compute the dot product , for this we will multiply the corresponding components together and then add.
In general, we have: $ \lt a , b\gt \cdot \lt c, d \gt =ac+bd$
Therefore,
$ \lt a5, 2 \gt \cdot \lt -4, 10 \gt = (5)(-4)+(2)(10)=-20+20=0$
