Help with A maths Paper.

• SBS1985C

  3 May 08, 00:12

  A) Given that a = 4i + 3j and b = -2i - 5j, find the unit vector parallel to a - b.

   

• secretliker

  3 May 08, 00:23

  a-b = 6i+8j

  unit vector parallel to a-b

  = (a-b) / | a-b |

  = 6i+8j / 10

  = 1/10 (6i + 8j) ?

• ^tamago^

  3 May 08, 00:28

  Unit vector = a/|a| = a/√(6²+8²) = a/10 = 3/5i+4/5j