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ConceptTypes of Matrices

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#### Question

If A is a square matrix such that A^{2} = I, then find the simplified value of (A – I)^{3} + (A + I)^{3} – 7A.

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If A is a square matrix, such that A^{2}=A, then write the value of 7A−(I+A)^{3}, where I is an identity matrix.

#### Reference Material

Solution for concept: Types of Matrices. For the courses 12th CBSE (Arts), 12th CBSE (Commerce), 12th CBSE (Science)