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# Matrices watch

1. That is the question --->https://gyazo.com/1b63be4386c27e06262b5f45656ab95e

Where have I gone wrong?
2. Well you've "pre-multiplied" on the the LHS and "post-multiplied" on the RHS.

Recall that matrix multiplication is (in general) not commutative!
3. (Original post by Indeterminate)
Well you've "pre-multiplied" on the the LHS and "post-multiplied" on the RHS.

Recall that matrix multiplication is (in general) not commutative!
Please define commutative for me
4. (Original post by Psst.)
Please define commutative for me
Oops, sorry

Addition is commutative because, eg, 3+4 = 4+3.
5. (Original post by Indeterminate)
Oops, sorry

Addition is commutative because, eg, 3+4 = 4+3.
No need to apologise for my retardiness

Thanks again!
6. (Original post by Psst.)
Please define commutative for me
is commutative on iff
7. (Original post by Psst.)
No need to apologise for my retardiness

Thanks again!

Tbf you're unlikely to get any exposure to this kind of terminology at A-level, so you're ok!

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