A is a n order matrix and \( A ^ { 2 } + 3 A + E = 0 , E \) is a identity matrix, then \( A ^ { - 1 } = ( \) _____
A. \( - A - 3 E \) B. \( A + 3 E \) C. \( 3 A + E \) D. \( E\)
Pregunta
Answer
A. \( - A - 3 E\)
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