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यदि A = [3-24-2] तथा I = [1001] एवंA2 = kA – 2I हो तो k ज्ञात कीजिए। - Mathematics (गणित)

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Question

यदि A = `[(3, -2),(4,-2)]` तथा I = `[(1,0),(0,1)]` एवं
A2 = kA – 2I हो तो k ज्ञात कीजिए।

Sum

Solution

दिया है, A = `[(3, -2),(4,-2)],` I = `[(1,0),(0,1)]`

`"A"^2 = "A". "A" = [(3, -2),(4,-2)] [(3, -2),(4,-2)]`

`= [(9 - 8, -6 + 4),(12 - 8, -8 + 4)]`

`= [(1,-2),(4,-4)]`

KA - 2I = K `[(3, -2),(4,-2)] - 2 [(1,0),(0,1)]`

`= [(3"k", - 2"k"),(4"k", -2"k")] - [(2, 0),(0,2)]`

`= [(3"k" + 2, -2"k"),(4"k", -2"k" + 2)]`

प्रश्न से,

`"A"^2 = "KA" - 2"I"`

`[(1,-2),(4,-4)] = [(3"k" - 2, -2"k"),(4"k", -2"k" - 2)]`

3k - 2 = 1

⇒ 3k = 3

k = 1

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आव्यूहों पर संक्रियाएँ - आव्यूहों के गुणन के गुणधर्म
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Chapter 3: आव्यूह - प्रश्नावली 3.2 [Page 90]

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NCERT Mathematics - Part 1 and 2 [Hindi] Class 12
Chapter 3 आव्यूह
प्रश्नावली 3.2 | Q 17. | Page 90
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