Question

Answer this question

Answer 1

$( {a}^{2} + a + 1)( {a}^{2} - a - 1 ) \\ \\ \tiny \rightarrow {a}^{2} ( {a}^{2} - a - 1 ) + a( {a}^{2} - a - 1) + 1( {a}^{2} - a - 1) \\ \\ \rightarrow \tiny {a}^{4} - {a}^{3} - {a}^{2} + {a}^{3} - {a}^{2} - a + {a}^{2} - a - 1 \\ \\ \rightarrow \tiny {a}^{4} - \cancel{ {a}^{3}} - \cancel{{a}^{2}} + \cancel{ {a}^{3} } - {a}^{2} - a + \cancel{ {a}^{2}} - a - 1 \: \\ \\ \rightarrow \: {a}^{4} - {a}^{2} - 2a - 1$

Answer 2

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