Help! How do we show/ solve this vector problem?? (1 Viewer)

[bubb]

Vectors & are defined in terms of , & as:
= + ( + ) − (2 + )
= + (3 + 2) − (5 − 3)

If = then show that:
|1.25 + 5 + 6| = √46

 

[Ambility]

Umm, what? I think your latex is playing up.

 

[LostInHSC]

You are in the Mathematics (Extension 1) forum.

Mathematics (Extension 2): http://community.boredofstudies.org/14/mathematics-extension-2/

 

[FrankXie]

two vectors are same if and only if all components are same. a=b, so z=1, 3y+2=x+y, 5x-3=2x+y, solving simutaneously we have x=4/5, y=-3/5, z=1, so the magnitude of 1.25xi+5yj+6zk=i-3j+6k is \sqrt{1^2+(-3)^2+6^2}=\sqrt{46}.