Given data:
The area of garden is A=60 sq-feet.
The expression for the lenght is l=4+w.
The area of garden is,
[tex]l\times w=60[/tex]
Substitute (4+w) in the above expression.
[tex]\begin{gathered} (4+w)w=60 \\ 4w+w^2=60 \end{gathered}[/tex]
Thus, the option 4 is correct.
