Question

whats the equation for: a. (b+c) if a = 5, b= 8 and c= 4?

Answer 1

this is a dotvector so its a.(b+c) (aDOT(b+C)

Answer 2

here is a visual of the question:
its iii

Answer 3

a=5,b=8,c=4
b+c=12,suppose,b+c=B and a=5=A
a.(b+c)=A.B=ABcostheta

Answer 4

is b+ c still 12 if you look at the attachment above?

Answer 5

well,it should be ,b+c=(Bx+Cx)i+(By+Cy)j+(Bz+Cz)k
i,j,k=unit vector

Answer 6

ok now im confused whare do i find x es and ys? and the i j k? if you dont mind can you plsease sub in the values?

Answer 7

but here,b+c=8

Answer 8

you don't have to,since they have given the exact value of b and c

Answer 9

i see so i shuld to the onther questions in the attachment the same way?

Answer 10

like the first questions is 8?

Answer 11

and the second is 80 degrees?

Answer 12

suppose,a=A,b+c=B
so,a.(b+c)=A.B=ABcostheta
I suppose