x³+7x²-x-7=? help plzz​

Answer:

(x + 7) × (x - 1) × (x + 1)

Formula:

[tex]x^{3} + 7x^{2} - x - 7 \\ x^{2} \times (x + 7) - (x + 7) \\ (x + 7) \times (x^{2} - 1) \\ (x + 7) \times (x - 1) \times (x + 1)[/tex]