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11. Suppose that A is a 3x3 matrix and det (A) = -3. What is det (4A)? %3D 12. Let A be a 3x3

11. Suppose that A is a 3x3 matrix and det (A) = -3. What is det (4A)? %3D 12. Let A be a 3x3 matrix, and suppose that the matrix B is obtained from A by the following row operations: If det (A)=12, what is det (B)? RR2; R3 R3+5R2

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