VECTORS F1

 

If u = 16i + 2j and v = 8i + 10j find 4u - 3v

 

solution

 

= 4u - 3v

 

= 4(16i + 2j) - 3(8i + 10j)

 

= 64i + 8j - 24i - 30j

 

= (64i - 24i) + (8j - 30j)    [grouping like terms]

 

= 40i - 22j

 

Hence 4u - 3v = 40i - 22j .

 

TRY THIS..................

 

If u = 10i + 3j and v = 11i + 4j;  find 6u - 2v.