Help with A maths Paper. replied by ^tamago^ @ Sat, 03 May 2008 00:28:23 +0800

^tamago^ — Sat, 03 May 2008 00:28:23 +0800

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

Help with A maths Paper. replied by secretliker @ Sat, 03 May 2008 00:23:50 +0800

secretliker — Sat, 03 May 2008 00:23:50 +0800

a-b = 6i+8j

unit vector parallel to a-b

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

= 6i+8j / 10

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

SBS1985C — Sat, 03 May 2008 00:12:15 +0800

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