let
w = width
l = length
l = 3w - 5
[tex]\text{area}=lw[/tex][tex]\begin{gathered} \text{area}=w(3w-5) \\ 28=3w^2-5w \\ 3w^2-5w-28=0 \end{gathered}[/tex][tex]\begin{gathered} 3w^2+7w-12w-28=0 \\ w(3w+7)-4(3w+7)=0 \\ (w-4)(3w+7)=0 \\ w=4 \end{gathered}[/tex]width = 4 m
length = 3(4) - 5 = 12 - 5 = 7 m
