$\left| {\,\begin{array}{*{20}{c}}x&4&{y + z}\\y&4&{z + x}\\z&4&{x + y}\end{array}\,} \right| = $
Easy
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$2 x+y-z=5$
$2 x-5 y+\lambda z=\mu$
$x+2 y-5 z=7$
ને અસંખ્ય ઉકેલો હોય,તો
$(\lambda+\mu)^2+(\lambda-\mu)^2=........$