Question

Factorise a^4 - 1. please send me the answers immediately​

Answer 1

Answer:

(a²+1)(a+1)(a-1)

Step-by-step explanation:

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

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