Question:
Using properties of determinants prove that:
$\left|\begin{array}{ccc}x+\lambda & 2 x & 2 x \\ 2 x & x+\lambda & 2 x \\ 2 x & 2 x & x+\lambda\end{array}\right|=(5 x+\lambda)(\lambda-x)^{2}$
Solution:
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