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प्रश्न
If A = `[(4, 5),(2, 5)]`, then |(2A)−1| = ______
पर्याय
`1/30`
`1/20`
`1/60`
`1/40`
उत्तर
`1/40`
APPEARS IN
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Solution:
AB = `[(4, 3, 2),(-1, 2, 0)] [(1, 2),(-1, 0),(1, -2)]`
AB = [ ]
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Cofactor Matrix [Aij] = `[(-2, 3),(-4, 3)]`
adj (A) = [ ]
A–1 = `1/|A| . adj(A)`
A–1 = `square`
