Answer:
Explanation:
We know area of a rectangle is xy where x and y are its dimensions.
A=xy
If we factor the area we will get the dimensions.
A=15k^4+35k^3+20k^2
(this can be factored in many ways to produce the same area, the answer choices you are given can be any given combination of factors.)
A=15k^4+15k^3+20k^3+20k^2
A=15k^3(k+1)+20k^2(k+1)
A=(15k^3+20k^2)(k+1) (this is one way)
A=5k(3k^2+4k)(k+1)
A=(3k^2+4k)(5k^2+5k) (and another way)
Either expression would give you width and length (or length and width) as they all produce the area of the original equation.