Question

Given vectors u=7i+3j and v=-4+3j find 5u-4v in terms of unit vectors i and j
a. 51i+3j
b.-2i+50j
c. 4i+50j
d.54i+50

Answer 1

Given :-

u = 7i + 3j

v = -4i + 3j

= 5u - 4v

= 5(7i+3j) -4(-4i + 3j)

= 35i + 15j + 16i - 12j

= 51i + 3j

Hence,

Option (A) 51i + 3j is correct.

Answer 2

Answer:

(a)

Step-by-step explanation:

5u = 35i + 15j

4v = -16i + 12j

so, 5u - 4v = 51i + 3j