Question

Which of the binomials below is a factor of this trinomial?

x2 - 9x + 20


A. x + 5
B. x + 2
C. x - 5
D. x - 2

Answer 1

factor: x^2 - 9x + 20
           (x)(x) (- 4)(- 5)

result = (x - 4)(x - 5)


irreducible factorization: 
(x - 5) (x - 4)

Check:
(x - 4)(x - 5)
(x)(x) (x)(- 5) (- 4)(x) (- 4)(- 5)
x^2 - 5x - 4x + 20
x^2 - 9x + 20



Hope that helps!!!