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OpenStudy (anonymous):
The matrix [4, 6; -6, "K"] is invertible if and only if "K" is not equal to ___? Can someone answer this question please?
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Directrix (directrix):
I'm out on a limb but I think the answer is k is not equal to -9. See attached file. http://www.wolframalpha.com/input/?i=inv+%7B+%7B4%2C+6%7D%3B+%7B-6%2C+k%7D+%7D
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