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Hi I am looking for help with this question Algebra (a) Suppose that A is an n X n matrix such that A2 + A

Hi I am looking for help with this question

Algebra (a) Suppose that A is an n X n matrix such that A2 + A + In : O. Prove that A is invertible. (b) Find all 2 X 2 matrices A : l a I] such that A2 + A+ I2 : 0. 1d

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