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Question:
If $\det \mathbf{A} = 4$ and $\det \mathbf{B} = -5,$ then find $\det (\mathbf{A} \mathbf{B}).$
Answer:
Let's think step by step.

user
-20
If $\det \mathbf{A} = 4$ and $\det \mathbf{B} = -5,$ then find $\det (\mathbf{A} \mathbf{B}).$
train