9. (5 points) Assume that A is a 3 × 4 matrix and B is a 4 × 3 matrix such that 0 0 AB (6:9) 0 1 0 001 Show that rank A

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9 5 Points Assume That A Is A 3 4 Matrix And B Is A 4 3 Matrix Such That 0 0 Ab 6 9 0 1 0 001 Show That Rank A 1 (79.83 KiB) Viewed 17 times

9. (5 points) Assume that A is a 3 × 4 matrix and B is a 4 × 3 matrix such that 0 0 AB (6:9) 0 1 0 001 Show that rank A = rank B = 3. - (Hint: for each vector V in R³, we have ABV = √. From here deduce that the null space of B consists only of the zero vector. Using the rank-nullity theorem, show that rank B = 3. Next, show that the column space of A is equal to R³, i.e. the equation Ax = has a solution for every right-hand side v. From here conclude that rank A = 3.) =