VECTORS-2

If u = 6i + 2j and v = 3i + 10j find 2u - 3v

solution

= 2u - 3v

= 2(6i + 2j) - 3(3i + 10j)

= 12i + 4j - 9i - 30j

= (12i + 9i) + (4j - 30j)

= 21i - 26j

Hence 2u - 3v = 21i - 26j

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

If u = 9i + 3j and v = 2i + 4j;  find 9u - 2v.