Question

(a+1)(a-1)(a² + 1) = ?
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Answer 1

$a + 1 a - 1 = {a}^{4}$

Answer 2

Step-by-step explanation:

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

We can write (a + 1)(a –1) as a^2 –1^2 using identity

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

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