Question

factorise the following:x⁴-y⁴​

Answer 1

${x}^{4} - {y}^{4} \\ 4 = (x + y) (x - y) \\ 4x + 4y = x - y \\ 4x + x = 3x \\ 4y - y = 3y \\ = 3x - 3y$

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