Question

X ^ 4 - 1 factorise using property a²-b²(a+b) (a-b) ​

Answer 1

(X)⁴ - 1

=(X²)² - (1)² [ (a)²-(b)² ]

=(X²-1)(X²+1).

=X²-1=0. Or. X²+1=0

=>X²=1. =>X²=-1

=>X=√1. =>X=√-1

=>X=1. =>X=-1. (Ans)