Question 1186397
{{{(2u+2)^2+u^2=13^2}}}, length and width and diagonal form a right triangle, longest side being the diagonal, so using Pythagorean Theorem.


{{{4u^2+8u+4+u^2=169}}}

{{{5u^2+8u=165}}}

{{{5u^2+8u-165=0}}}


discrimin, {{{64+20*165=3364=58^2}}}


{{{u=(-8+58)/10}}}
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60 square meters