9x的n加2次方-27x的n加1因式分解

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9x的n加2次方-27x的n加1因式分解
9x的n加2次方-27x的n加1因式分解

9x的n加2次方-27x的n加1因式分解
9x^(n+2)-27x^(n+1)
= 9x^(n+1)*(x-3)

9 x^(n+2) - 27x^(n+1)
= 3^2 . x^(n+2) - 3^3 . x^(n+1)
= 3^2 ( x^(n+1) ) ( x - 3 )

原式=9x^(n+1)*(n-3)