if AB =

[1 1]

[3 4] and =

[1 -1]

[1 2], find A

I know it's a simple question, i am just not sure if

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- Apr 6th 2010, 12:48 PMwopashuiFind A
if AB =

[1 1]

[3 4] and =

[1 -1]

[1 2], find A

I know it's a simple question, i am just not sure if

- Apr 6th 2010, 02:26 PMtonio
- Apr 7th 2010, 04:53 AMHallsofIvy
By the "associative law", . By the definition of "multiplicative inverse", and by the definition of "multiplicative identity", .