Question

factorise the polynomial x⁴-1

Answer 1

(x2)^2-(1)^2
(x2-1)(X2+1)
{(x)2-(1)2}(X2+1)
(x-1)(x+1)(x2+1)

Answer 2

x^4=1
x=(1)^1/4
x=+1 ,+1 , -1 ,-1

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