Question

19). (a+1)(a-1)(a²+1) = ?
O *+
(a +2a2-1)
(a*-a2-1)
(24-1)
0 (a4+1)​

Answer 1

Answer:

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

Using identity

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

Answer 2

Answer:

$(x + y)(x - y) = x {}^{2} - y {}^{2}$