Factor.

x^2-9x+20

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First, you'd look at what can multiply together to make 20. You can multiply 10x2, 1x20, or 4x5 (or change them so each number is a negative) to make a positive 20. You then must look at which one of these can be added or subtracted together to create - 9. Negative 4 and 5 can be subtracted to make - 9, so you would factor them out, as well as the x^2, and get the answer (x-4) (x-5).

Answer: (x-4) (x-5)

(x-5) (x-4)

Step-by-step explanation:

x^2-9x+20

Using AC method

4 * 5 = 20 and 4 + 5 = 9

= (x-5) (x-4)