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JEE Mains · Maths · STD 12 - 3 and 4 . metrices and determinant

माना \(A=\left[a_{i j}\right]\) एक \(3 \times 3\) क्रम का आव्यूह है, जहाँ \(a_{i j}=(\sqrt{2})^{i+j}\) है। यदि \(A^2\) की तीसरी पंक्ति के सभी अवयवों का योगफल \(\alpha+\beta \sqrt{2}, \alpha, \beta \in \mathbf{Z}\) है, तो \(\alpha+\beta\) = ___

  1. A 280
  2. B 224
  3. C 210
  4. D 168
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Answer & Solution

Correct Answer

(B) 224

Step-by-step Solution

Detailed explanation

\begin{aligned} & A=\left[\begin{array}{lll}(\sqrt{2})^2 & (\sqrt{2})^3 & (\sqrt{2})^4 \\ (\sqrt{2})^3 & (\sqrt{2})^4 & (\sqrt{2})^5 \\ (\sqrt{2})^4 & (\sqrt{2})^5 & (\sqrt{2})^6\end{array}\right] \\ & A=\left[\begin{array}{ccc}2 & 2 \sqrt{2} & 4 \\ 2 \sqrt{2} & 4 & 4 \sqrt{2}…

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