Eigen Values Doubt

Question

Let there is a 2*2 Matrix and their eigen values are A and B. The eigen values of $(A+7I)^{-1}$ ?

Comments

1/A+7   ,1/B+7

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Please explain it

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the question is incorrect. you've mentioned one of the eigen values is A

so how can you compute eigen value of  $|A+7I|^{-1}$

A is not a matrix