Mathematics Matrices Operations on Matrices

If  \(f(x) = \left[ {\begin{array}{*{20}{c}} x&λ \\ {2λ }&x \end{array}} \right]\;\) then |f(λx) - f(x)| is equal to ? 

1
\(x({\lambda ^2} - 1)\)
2
\({\lambda ^{^2}}({x^2} - 1)\)​
3
\(\lambda ({x^2} - 1)\)
4
\({x^2}({\lambda } - 1)^2\)

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