(ii) p4 - 81 factorise
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p
4
−81
=p
4
−(3)
4
=(p
2
)
2
−(3
2
)
2
Using,[a
2
−b
2
=(a+b)(a−b)]
=(p
2
+3
2
)(p
2
−3
2
) Using,[a
2
−b
2
=(a+b)(a−b)]
=(p
2
+3
2
)(p+3)(p−3)
snding the attachment
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