Question 901753
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Hi,
     *[illustration rectangle.png].
a = Lw = (2w+5)w
2w^2 + 5w = 42m^2
2w^2 + 5w -42 = 0
(2w -7)(x+6) = 0, using Positive Solution only
 w = 7/2 m
L = 12m  {{{2(7/2) + 5}}}