## Em5623 Group Title Does the matrix 1 , 2 have an inverse? -2 , 4 11 months ago 11 months ago

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1. satellite73 Group Title

so long as the determinant is not zero, it does

2. itsmylife Group Title

calculate the mod of the matrix

3. satellite73 Group Title

the determinant of your matrix is $$1\times 4-2\times (-2)=8$$ so you should be in good shape