The rectangle below has an area of 15k^4+35k^3+20k^215k 4

+35k

3

+20k

2

15, k, start superscript, 4, end superscript, plus, 35, k, cubed, plus, 20, k, squared.

The width of the rectangle is equal to the greatest common monomial factor of 15k^4, 35k^3,15k

4

,35k

3

,15, k, start superscript, 4, end superscript, comma, 35, k, cubed, comma and 20k^220k

2

20, k, squared.

What is the length and width of the rectangle?