Question: 3. Let A be a general matrix. Show the following results. (a) (4) Col AT = (Nul A) . (b) (4) (Nul A) = (Nul

3. Let A be a general matrix. Show the following results. (a) (4) Col AT = (Nul A) . (b) (4) (Nul A) = (Nul ATA). (c) (4) AT Ax = Ab is always consistent

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