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If A is square matrix such that A^2=A, then (I+A)^3-7A is equal to (a) A (b) I-A (c) I (d) 3A

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If A is square matrix such that A2=A, then (I+A)3-7A is equal to 
(a) A (b) I-A (c) I (d) 3A

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Answer: (c) I

Given that

A2=A

We have to find (I+A)2-7A

(I+A)3-7A

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