If you mean n squared+11n+18 then it is (n+2)(n+9) when factored
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n2 + 11n + 18 = n2 + 2n + 9n + 18 = n(n+2) + 9(n+2) = (n+9)*(n+2)
n2 - 11n - 26what two factors of - 26 add up to - 11?(n + 2)(n - 13)===========
Assuming you mean n2 + 11n + 30, the factors are (n + 6)(n + 5).
F.O.I.L First, outer, inner, and last. (n - 1) (n - 10)
n2 + 9n + 18 = (n + 6)(n + 3)