Mathematics · Matrices
If A is a square matrix such that A2 = I (where I is the identity matrix), then the simplified value of the matrix expression A3 + (A + I)2 - 5A - 12I is:
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1-3A - I
- 22I + A
- 32I - 2A✓
- 4A - 5I
Correct answer
2I - 2A
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