4. Let A and B be two n × n matrices. Suppose that AB is invertible....

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4. Let A and B be two n × n matrices. Suppose that AB is invertible. Show that the system Ax = 0 has only the trivial solution

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2) let A and B be two nan makrices, let AB is investible. Then det CAB) 70. Since det CAB) det CAJ. Let (B) 2 then det (AB) &

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