MATH10120 Final: Math10120F14 Exam Solutions ReviewFinite Final copy
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3 (d) 2 (e) (b) 3 (c) 1. 3 (d) 2 (b) 3 (c) 1 (e) If ad - bc is not zero, the inverse of the matrix a c b d is given by. Since 2 1 1 3 = 1 6= 0, the inverse of the matrix 2. (a b) c = 0. Find the entry in the second row and rst column of the matrix c d. (a) 10 (b) 4 (c) 7 (d) 17 (e) 0. 0 5 + 2 1 + 4 2 2 2. Which of the following statements is true? (a) a 1 does not exist. False, a 1 does exist because det a = 5 2 = 3 6= 0. (b) c b does not exist. True, because c3 2 and b3 2 do not have compatible dimensions for multiplication. (c) d c does not exist.
