the names of a flag is 7 inches more than its height ......

The area of a rectangle (flag) is:
Area = length * height
in this case:
length = 7 + height
[tex]l=7+h[/tex]Therefore the area is:
[tex]\begin{gathered} A=l\cdot h \\ A=(7+h)\cdot h\text{ square inches} \end{gathered}[/tex]