please don't give incorrect answers (std11) sum
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ii.Explanation:
(
a
4
−
81
)
=
(
(
a
2
)
2
−
9
2
)
and is therefore the difference of squares with factors
XXX
(
a
2
+
9
)
(
a
2
−
9
)
but
(
a
2
−
9
)
=
(
a
2
−
3
2
)
is also the difference of squares with factors
XXX
(
a
+
3
)
(
a
−
3
)
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Remember: Factoring the Difference of Squares
XXX
(
x
2
−
y
2
)
=
(
x
+
y
)
(
x
−
y
)
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