Question

Factorise x power 4 - 1

Answer 1

Answer:

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${x}^{4} - 1 \\ ({ {x}^{2} )}^{2} - {1}^{2} \\ ( {x}^{2} - 1)( {x}^{2} + 1) \\ ({x}^{2} - 1) = (x - 1)(x + 1) \\ \\ so \: \: \: {x}^{4} - 1 = \green {\underline{ (x + 1)(x - 1)( {x}^{2} + 1)}}$