Byju's Answer
Standard VIII
Mathematics
Factorisation Using Algebraic Identities
ii Factorise ...
Question
Question 4(ii)
Factorise
p
4
−
81
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Solution
p
4
−
81
=
(
p
2
)
2
−
(
9
)
2
=
(
p
2
−
9
)
(
p
2
+
9
)
=
[
(
p
)
2
−
(
3
)
2
]
(
p
2
+
9
)
=
(
p
−
3
)
(
p
+
3
)
(
p
2
+
9
)
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1
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