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# Vectors - how to 'show' additive and multiplicative properties Watch

1. Hi, looking back at some vector stuff from back in my alevel days, and forgotten how to go about 'showing' results. So say vectors u, v, z are of the same order and c,d are constants, how would I prove the basic

U+v = v + u and (c+d)(u + v)

Thanks

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2. (Original post by BackToMathsAgain)
Hi, looking back at some vector stuff from back in my alevel days, and forgotten how to go about 'showing' results. So say vectors u, v, z are of the same order and c,d are constants, how would I prove the basic

U+v = v + u and (c+d)(u + v)
For the additive property that you're trying to prove (commutativity), it depends on how you want to prove it. You can do it graphically via the properties of a parallelogram, or algebraically, coordinate-wise, where it's trivial since addition of real-valued coordinates is commutative.

It's not clear what multiplicative properties you want to prove, since you can't multiply vectors as you seem to be doing. Are you referring to the dot and cross products?
3. (Original post by BackToMathsAgain)
Hi, looking back at some vector stuff from back in my alevel days, and forgotten how to go about 'showing' results. So say vectors u, v, z are of the same order and c,d are constants, how would I prove the basic

U+v = v + u and (c+d)(u + v)

Thanks

Posted from TSR Mobile
Draw diagrams.
4. Thanks very much
5. I just want to double check.

By "multiplicative properties", do you mean scalar multiplicative properties?

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