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If Lambda(x)=|[0, 2x-2, 2x+8],[x-1, 4, ...

If `Lambda(x)=|[0, 2x-2, 2x+8],[x-1, 4, x^2+7],[0, 0, x+4]| and f(x)=sum_(j=i)^1 sum_(i=1)^3a_(ij)c_(ij),` where `a_(ij)` is the element of `i^(th) and j^(th)` column in `Delta(x) and c_(ij)` is the cofactor `a_(ij) AA i and j,` then find the greatest value of `f(x),` where `x in[-3,18]`

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