Question

x^4-1.state the formula​

Answer 1

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Answer 2

Answer

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

Identity used:

$a^{2} - b^{2} = (a+b)(a-b)$