Question

Find a•b. a=<2,4>, b= <2,5>

Answer 1

a • b = 24

Explanation:

`<a,\ b>\circ<c,\ d>=ac+bd\\\\a=<2,\ 4>,\ b=<2,\ 5>\\\\a\circ b=<2,\ 4>\circ<2,\ 5>=(2)(2)+(4)(5)=4+20=24`