Algebra (a) Suppose A is a 3 × 3 matrix such that A H Using theorems from the course, find the determinant of A - 21 (and explain your answer with reference to the course results). (b) Let A = || a b c de f Lg h i with real numbers a, b, c, d, e, f, g, h, i such that det(A) = 3. What is the determinant of B N28 Give a justification for your answer. a b с 1420 d+2a e+2b f+ 2c ? 2g 2h 2i

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