Question 1156438
side length of original square;
13 inches


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L, side length of original square carboard

Taking 2 inch square from each corner, each base length is  {{{L-2*2=L-4}}}.

{{{2(L-4)^2=162}}}

{{{(L-4)^2=81}}}

{{{L-4=9}}}

{{{highlight(L=13)}}}