Verified answer

Step-by-step explanation:

(x+1) (x-1) {(a+b) (a-b)= a² -b²}

(x² - 1²) (x²+1) (x⁴ + 1)

(x²- 1) (x² + 1) (x⁴+ 1)

{(x²)² - 1²} (x⁴ + 1)

(x⁴- 1) (x⁴ + 1)

or

(x⁴)² - (1)²

x⁸ - 1