If $\det \mathbf{A} = -1,$ then find $\det (\mathbf{7A}).$
Question:
If $\det \mathbf{A} = -1,$ then find $\det (\mathbf{7A}).$
Answer:
Let's think step by step.

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If $\det \mathbf{A} = -1,$ then find $\det (\mathbf{7A}).$
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