Question 735737
you find the factor by starting with factors of 20..

so you can have 1x20, 2x10, 4x5,  of these pairs would be most likely to produce a -x...my guess would be 4 and 5...since it is a -20 in the equation then there need to be one neg number and one positive number.

so I would start with:

(x-5)(x+4) this will equal

x^2 + 4x - 5x - 20 combine like terms

x^2 - x - 20

so the factors are:

(x-5) and (x + 4)