l=40w=x
The perimeter of a rectangle is equal to the sum of all sides of the rectangle.
length+length+width+width=2⋅(length)+2⋅(width)
Substitute the values of the length l=40 and width w=x into the formula for the perimeter of a rectangle.
2⋅40+2⋅x
Multiply 2 by 40.
80+2x
Find the Perimeter rectangle (40)(x)
