Teaching EMRS TGT Mock Test 2023 Engineering Mathematics Linear Algebra Eigenvalues

Let the characteristic equation of a matrix M be λ2 - λ - 1 = 0, then 

1
M-1 does not exist
2
M-1 exists but cannot be determined from the data
3
M-1 = M - 1
4
M-1 = M + 1
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