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x2-15x+54

factor pairs of 54:

1,54

2,27

3,18

6,9

-1,-54

-2,-27

-3,-18

-6,-9 <-6 and -9 sum to -15

x2-6x - 9x+54

x(x-6) - 9(x-6)

(x-6)(x-9)

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14y ago

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