Answer:
(x − 5) (x + 4)
Step-by-step explanation:
x² − x − 20
Factor using AC method:
1 × -20 = -20
Factors of -20 that add up to -1: -5 and 4
Divide by 1 and reduce: -5/1 and 4/1
[tex]\displaystyle [x + 4][x - 5][/tex]
Find two quantities that when differed to −1, they also multiply to −20, and those numbers are 4 and −5.
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