27:_ 27,1,3,9
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You can't know if a general polynomial is in factored form.
You multiply the factors.
2x + 3 can be factored as follows: 2(x + 1.5)
2a^3 + 54 can first be factored into 2 (a^3 + 27). This can then be factored out to 2 (a + 3) (a^2 - 3a + 9).
It is 7*7*7.