Let B = 1+2i -(142). -3 i) Compute ||B||1 and ||B||2. ii) Is B invertible? If...

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Let B = 1+2i -(142). -3 i) Compute ||B||1 and ||B||2. ii) Is B invertible? If yes, then compute ||B-||2 and K2(B). Let B = 1+2i -(142). -3 i) Compute ||B||1 and ||B||2. ii) Is B invertible? If yes, then compute ||B-||2 and K2(B).