Question 1137995

L = W + 4
LW = 21

(W+4)W = 21
{{{ W^2 + 4W - 21 = 0 }}}
{{{ (W+7)(W-3) = 0 }}}

W=3  (discard solution W=-7)

This implies L=7
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Answer: Length is 7in, width is 3in