Evaluate : (a+1) (a-1) (a^2+1) - Vidyadip

Question

Evaluate : $(a+1) (a-1) (a^2+1)$

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Answer

$(a+1) (a-1) (a^2+1)$
$= [(a)^2−(1)^2] (a^2+1)$
$= (a^2−1) (a^2+1)$
$= (a^2)^2 − (1)^2$
$= a^4 − 1$

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