Question

Expand (x-1) (x+1) (x^2+1) (x^4+1)

Answer 1

that will work.......

Answer 2

$(x - 1)(x + 1)( {x}^{2} + 1)( {x}^{4} + 1) \\ \\ = ( {x}^{2} - 1)( {x}^{2} + 1)( {x}^{4} + 1) \\ \\ = ( {x}^{4} - 1)( {x}^{4} + 1 )\\ \\ = ( {x}^{8} - 1)$