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If A = ab[100010ab-1], show that A2 is a unit matrix - Mathematics

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प्रश्न

If A = `[(1, 0, 0),(0, 1, 0),("a", "b", - 1)]`, show that A2 is a unit matrix

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उत्तर

A = `[(1, 0, 0),(0, 1, 0),("a", "b", - 1)]`

A2 = A . A

= `[(1, 0, 0),(0, 1, 0),("a", "b", - 1)] [(1, 0, 0),(0, 1, 0),("a", "b", -1)]`

= `[(1 + 0 + 0, 0 + 0 + 0, 0 + 0 + 0),(0 + 0 + 0, 0 + 1 + 0, 0 + 0 + 0),("a" + 0 - "a", 0 + "b" - "b", 0 + 0 +1)]`

A2 = `[(1, 0, 0),(0, 1, 0),(0, 0, 1)]`

Thus, A2 is a unit matrix.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 7: Matrices and Determinants - Exercise 7.1 [पृष्ठ १८]

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सामाचीर कलवी Mathematics - Volume 1 and 2 [English] Class 11 TN Board
पाठ 7 Matrices and Determinants
Exercise 7.1 | Q 8 | पृष्ठ १८
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