Question

factorise completely (x^4-1)​

Answer 1

Answer:

(x²+1)(x+1)(x-1)

Step-by-step explanation:

x⁴-1

= (x²)²-(1)²

= (x²+1)+(x²-1)

= (x²+1)((x)²-(1)²)

= (x²+1)(x+1)(x-1)

using formula x²-y² = (x+y)(x-y)