18 A = 0 9 Consider the matrices 90 18 and (2C)" + 2B" with If it is known that 13 B+ A certainty the matrix B that satisfies this equation corresponds to: 33 18 a) -15 9. 36 -9 -33 39 b) 0. -21 36 -9 39 -33 36 c) 0 - 15 -9 18 6. -33 39 0 18 0 21 9 39 d) 6. 27

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