a) Factorize the following expression completely:
\[x^4 + 9x^2 + 81\]
\[(x^2 + 3x + 9)(x^2 - 3x + 9)\]
MR/Nasef.N
b) Multiple Choice: What is the complete factorization of \(x^4 + 9x^2 + 81\)?
\((x^2 + 3x + 9)(x^2 - 3x + 9)\)
\((x^2 + 9)^2\)
\((x^2 + 9)(x^2 + 9)\)
\((x + 3)^2(x - 3)^2\)
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