मराठी

If A = [(1, 0),(0, -1)], show that A3 = A. - Mathematics

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प्रश्न

If A = `[(1, 0),(0, -1)]`, show that A3 = A.

सिद्धांत
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उत्तर

A = `[(1, 0),(0, -1)]`

A2 = A × A

= `[(1 xx 1 + 0 xx 0, 1 xx 0 + 0 xx (-1)),(0 xx 1 + (-1) xx 0, 0 xx 0 + (-1) xx (-1))]`

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

= I

A3 = A2 × A

= `[(1, 0),(0, 1)] xx [(1, 0),(0, -1)]`

= `[(1 xx 1 + 0 xx 0, 1 xx 0 + 0 xx (-1)),(0 xx 1 + 1 xx 0, 0 xx 0 + 1 xx (-1))]`

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

= A

∴ A3 = A

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पाठ 8: Matrices - Exercise 8C [पृष्ठ १६५]

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नूतन Mathematics [English] Class 10 ICSE
पाठ 8 Matrices
Exercise 8C | Q 13. | पृष्ठ १६५
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