I Linear Algebra Conditions: Solving for ab ≠ 1

Terry_Destefano
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http://imgur.com/a/xIydC
The answers is b) ab≠1, but I have no clue how to get to that answer... Can someone help me? :D
 
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Sure. Fill in the homework template and show what you did to try and find an answer ... guidelines :rolleyes:
 
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