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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- April 6th 2010, 11:48 AMwopashuiFind 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

- April 6th 2010, 01:26 PMtonio
- April 7th 2010, 03:53 AMHallsofIvy
By the "associative law", . By the definition of "multiplicative inverse", and by the definition of "multiplicative identity", .