Question

Factorise:
${x}^{4} - (x - z)^{4}$
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Answer 1

$( {x}^{2})^{2} - (( {x - z})^{2} ) {}^{2} \\ (x^{2} + (x + z)^{2} )( {x}^{2} - (x + z) {}^{2} ) \\ (2 {x}^{2} + {z}^{2} + 2zx)(x + x - z)(x + z - x)$