Question

121. If a nonsingular matrix A is such that 3A3 + 2A2 + 5A + I = 0, then | A-1 is equal to: । यदि एक व्युत्क्रमणीय आव्यूह A इस प्रकार है कि 3A3 + 2A2 + 5A + I = 0 ता । | A-1 का मान होगा : ० (2) 3A2 + 2A + 5I (1) -(3A2 + 2A + 5) (3) 3A2 - 2A - 5I (4) -(3A2 + 2A + 5I)

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( quad 3 A^{3}+2 A^{2}+5 A+I=0 ) ( Rightarrow 3 A^{2}+2 A+5+A^{-1}=0 quad( ) Ap Mulliblymg both ( Rightarrow quad A^{-1}=-left(3 A^{2}+2 A+5right) )