Question

(×-1) (×+1) (×2+1) (×4+1)​

Answer 1

(x+1)(x-1)(x²+1)(x⁴+1)

By using a²-b²=(a+b)(a-b)

(x²-1)(x²+1)(x⁴+1)

= (x⁴-1)(x⁴+1)

= x⁸-1