Question

is this right?

Answer 1

show that (ku ⃗)∙(v ⃗)=k(u ⃗∙v ⃗) for vectors in two space.

Given u ⃗=(x_1,y_1),v ⃗=(x_2,y_2)
(ku ⃗)∙(v ⃗)=(k(x_1,y_1))(x_2,y_2)
=(kx_1,ky_1)(x_2,y_2)
=kx_1 x_2+ky_1 y_2
=k(x_1 x_2+y_1 y_2)
=k(u ⃗∙v ⃗)

Answer 2

yes ur correct

Answer 3

To me, you should go on 2 column-proof

Answer 4

@Bebong no need for that lol
@cutepochacco u did great ^

Answer 5

I mean
@ikram002p the proof above is weak at line 4 to line 5

Answer 6

* line5 to line6

Answer 7

O.O IMHO i dnt think so :P
but u have ur point of view as well

Answer 8

Linear algebra!!! I hate it!! it beats me up

Answer 9

meh worth two marks.

Answer 10

i just pretty much followed the example from the textbook and changed it from three space to two space

Answer 11

thank you for the replies