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Question: Answered & Verified by Expert
If $\left(\begin{array}{ll}2 & 3 \\ 4 & 1\end{array}\right) \times\left(\begin{array}{cc}5 & -2 \\ -3 & 1\end{array}\right)=\left(\begin{array}{cc}1 & -1 \\ 17 & \lambda\end{array}\right)$, then what is $\lambda$ equal to?
MathematicsMatricesNDANDA 2013 (Phase 2)
Options:
  • A 7
  • B $-7$
  • C 9
  • D $-9$
Solution:
1399 Upvotes Verified Answer
The correct answer is: $-7$
$\left(\begin{array}{ll}2 & 3 \\ 4 & 1\end{array}\right) \times\left(\begin{array}{cc}5 & -2 \\ -3 & 1\end{array}\right)=\left(\begin{array}{cc}1 & -1 \\ 17 & \lambda\end{array}\right)$
$\left(\begin{array}{cc}1 & -1 \\ 17 & -7\end{array}\right)=\left(\begin{array}{cc}1 & -1 \\ 17 & \lambda\end{array}\right)$
$\lambda=-7$

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