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Question: Answered & Verified by Expert
If $\mathrm{A}$ is a square matrix of order $\mathrm{n}>1$, then which one of the $\begin{array}{ll}\text { following is correct? } \end{array}$
MathematicsDeterminantsNDANDA 2019 (Phase 1)
Options:
  • A $\operatorname{det}(-\mathrm{A})=\operatorname{det} \mathrm{A}$
  • B $\operatorname{det}(-\mathrm{A})=(-1)^{\mathrm{n}} \operatorname{det} \mathrm{A}$
  • C $\operatorname{det}(-\mathbf{A})=-\operatorname{det} \mathbf{A}$
  • D $\operatorname{det}(-\mathrm{A})=\mathrm{n} \operatorname{det} \mathrm{A}$
Solution:
1309 Upvotes Verified Answer
The correct answer is: $\operatorname{det}(-\mathrm{A})=(-1)^{\mathrm{n}} \operatorname{det} \mathrm{A}$
$\mathrm{A}$ is square matrix of order $\mathrm{n}>1$. $\operatorname{det}(-\mathrm{A})=(-1)^{\mathrm{n}} \operatorname{det} \mathrm{A}$

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