Question

Can you please check these answers.
In exercises 10-13 , find (a)2v+u, (b)u-3v), and (c)5u-v.
10.u=<0,-4>, v=<-2,-8>
a) 2v+u
= <-4,-16) + <0,-4)
= <-4, -20>
b,u-3v
=<0,-4>- <-6,-24>
=<6,20>

c) 5u - v
= <0,-20> - <-2,-8)
= <2, -12>
11.u=<-2,-3>, v=<-1,-10>
a,2v+u
=<-2,-20>+<-2,-3>
=<-4,-23>
b,u-3v
=<-2,-3>-<-3,-30>
=<1,0>
c,5u-v
=<-10,-15>-<-1,-10>
=<-9,-5>
u=i-j v=6i+9i
a. 2v+u
u=i-j, v=6i+9i
=(12i+18j) + (i-j)
=13i+ 17j
b. u-3v
(i-j)-(18i+27i)
-17i - -26j
c. 5u-v
(5i-5j)-(30i+54j)
-25i - -59j

u=2i+3j, v= -i-2j
U=2i+3j, v=-i-2j
a. 2v+u
-2i+-4j + 2i+3j
0, -j
b. U-3v
2i+3j –(-3i)-6j
5i-(-3j)
c. 5u-v
10i+15j – (-i)-2j
11i-13j

Answer 1

I checked the first 4, they were ok

you seem to know what you are doing.