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OpenStudy (anonymous):
MATRIX HELP!?!?
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OpenStudy (anonymous):
what is the determinant of each?
OpenStudy (anonymous):
A is inversible if \[\det(A) \neq 0\] for \[A = \left[\begin{matrix}a & b \\ c & d\end{matrix}\right], \det (A) = ad- bc\]
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