VECTORS 2

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

solution

= 2u - 6v

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

= 12i + 4j - 18i - 60j

= (12i + 18i) + (4j - 60j)

= 30i - 56j

Hence 2u - 6v = 30i - 526j

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

If u = -4i + 3j and v = 2i + 4j;  find 7u - 2v.