Question

Factorise a^4-1 using (a+b)(a-b) formula

Answer 1

here is Ur answer
please mark it as brainliest..

Answer 2

Solution: We can write a⁴-1 as (a²)²-1²
                (a²)²-1²=(a²+1)(a²-1)
                           =(a²+1)(a+1)(a-1)
                         a=+-1