Question

Given vectors u= 4i+9j and v= -3i+ 7j, find 7u-7v in terms of i and j

Answer 1

7u = 7*4i+9*7j
-7v = (-7)(-3)i+(-7)(7)j
7u-7v=7u+(-7v) = 7*4i+9*7j+(-7)(-3)i+(-7)(7)j=7*4i+(-7)(-3)i+9*7j+(-7)(7)j

= (7*4+(-7)(-3))i+(9*7+(-7)(7))j

Answer 2

Thank you so much!

Answer 3

np

Answer 4

I prob coult have done the easy arithmetic and made it look better

7u=21i-49j
....

Answer 5

The answer options are
A: 9i+48j
B: 52i+48j
C: 15i+48j
D: 49i+14j