Question

(a²−1) (a²+1)
I need answer urgently.Please help.
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Answer 1

$(a²−1) (a²+1) \\ {a}^{4} + {a}^{2} - {a}^{2} - 1 \\ {a}^{4} - 1 = {a}^{4} - {1}^{4} \\ = ({ {a}^{2} )}^{2} - { ({1}^{2} )}^{2} =( {a}^{2} - 1)( {a}^{2} + 1)$

Again factorise a² - 1

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

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

Is your answer....↖️↗️

Hope this will be helpful.