Remember that the formula for the perimeter of a rectangle is:
[tex]2w + 2l[/tex]
- [tex]w[/tex] is the width of the rectangle
- [tex]l[/tex] is the length of the rectangle
Thus, in this case, you can see that we are adding two of the same monomials and two of another monomial. One monomial is [tex]x + 15[/tex] and another monomial is [tex]x + 5[/tex]. In this case, these monomials would fulfill the perimeter equation of a rectangle.
Applying this perimeter structure, we can find that this expression represents a perimeter equation of a rectangle with sides x + 15 and x + 5.
