The expression for the length of fencing to go around the outer edges is  10x+10.
What is the perimeter of a rectangle?
- The perimeter of a rectangle is the twice the sum of length and width.
- Perimeter of a rectangle = 2(l+b)
Length of the rectangular field is given by x+7
and width is given by 4x-2
Length of fencing outer edges is equal to its perimeter.
Perimeter of a rectangle = 2(l+b)
=2(x+7+4x-2)
=2(5x+5)
=10x+10
Hence, the length of fencing outer edges is 10x+10
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