I have no idea what to do for either of these questions 1. If A = |x -1| |y -1| determine the value of x and y such that A^2=A 2. The matrix |2 -9| |9 k| is invertible if and only if k !=??
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1. 2.
Last edited by math2009; Feb 9th 2010 at 04:22 AM.
thanks
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