Question

Factor: x2 - 19x – 20
A. (x – 18)(x - 1)
B. (x – 20)(x + 1)
C. (x – 20)(x - 1)
D. (x - 10)(x - 2)

Answer 1

two numbers that add to multiply to be -20 and add together to be -19

Answer 2

B.

Answer 3

x^2-19x-20

x^2-20x+x-20

x(x-20)+1(x-20)

(x-20)(x+1)

=> Factors are
(x-20)(x+1)