Question

Let u = <5, 6>, v = <-2, -6>. Find -2u + 5v.

a. <-20, -42>

b. <-20, 0>

c. <0, 18>

d. <-6, 0>

Answer 1

-2u +5v
= -2 < 5,6> + 5<-2,-6>
= <-2*5, -2*6 > + <5*-2, 5*-6>
= <-10,-12> + <-10,-30>
= <-10 + (-10) , -12 + (-30) >
= <-20, -42>
please check my work

Answer 2

okay you got it i see what i was doing wrong now:) thxx