: 4. For a 2×2 matrix to ue stable the following conditions are to be met: a) The trace and leterminant are both to be
: 4. For a 2×2 matrix to ue stable the following conditions are to be met:
a) The trace and leterminant are both to be positive
b) Trace and deter minant are both to be negative
c) The determinant must be negative and the trace positive
d) The trace has to be negative and the determinant positive
e) None of the above
5. Which of the following se:ntences is false
a) The determinant «.f A-B equals det A – det B
b) If A is not invertil le then AB is not invertible
c) The determinant of A is ± the product of its pivots
d) AB and BA have the same determinant
e) All sentences are false
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