Given
The length is given 4x-1.
The width is given x.
The height is given
The volume is given
Explanation
The degree of length is 1.
The degree of width is 1.
The degree of height is 3.
The degree of volume is 5.
It is clearly seen that
The sum of the degrees of the length, width and height is degree of volume.
Answer
Hence the sum of the degrees of the each factor is the degree of the product.