Choose the correct answer from the given alternatives in the following question: If A−1 = - $\frac{1}{2}$[(1,-4),(-1,2)], then A = ______.

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KollegeApply · Accepted Answer

[(2,4),(1,1)] Explanation: A−1 = 1/|"A"| adj. A A−1 = - $\frac{1}{2}$[(1,-4),(-1,2)] $\therefore$ 1/|"A"| adj. A = - $\frac{1}{2}$[(1,-4),(-1,2)] $\therefore$ adj. A = - $\frac{1}{2}$[(1,-4),(-1,2)] A = [(2,4),(1,1)]

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