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The matrices A=(1xy1) and B=(1xy1)
are inverses. What is xy?

 Feb 28, 2019
 #1
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The matrices

 

A=(1xy1) and B=(1xy1)

 

are inverses.

What is xy?

 

AB=I(1xy1)(1xy1)=(1001)(1+xyxxy+yxy1)=(1001)(xy100xy1)=(1001)

 

xy1=1xy=2

 

laugh

 Feb 28, 2019

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