## Intermediate Algebra (6th Edition)

$(x^n-6)(x^n+3)$
The given expression can be written as: $\\(x^n)^2-3x^n-18$ The constant term of $-18$ has the factors $-6$ and 3, the sum of which, -3, is equal to the coefficient of the middle term Thus, the factored form of the given trinomial is: $\\=(x^n-6)(x^n+3)$