<PRE><B>Question 247862</B>
L=w+3
L*W=40
(W+3)*w=40
w^2+3w=40
complete  the square
add (3/2)^2 to both sides
w^2+3w+9/4=169/4
(w+3/2)^2=(13/2)^2
w=-3/2+13/2=10/2=5
w=-3/2-13/2=-16/2=-8


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