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Mathematics
Mathematics
Problem
Factorise
x
4
−
81
x^{4}-81
x
4
−
81
completely. a)
(
x
2
−
9
)
(
x
2
+
9
)
(x^{2}-9)(x^{2}+9)
(
x
2
−
9
)
(
x
2
+
9
)
b)
(
x
−
3
)
2
(
x
+
3
)
2
(x-3)^2(x+3)^2
(
x
−
3
)
2
(
x
+
3
)
2
c)
(
x
−
3
)
(
x
+
3
)
(
x
2
+
9
)
(x-3)(x+3)(x^{2}+9)
(
x
−
3
)
(
x
+
3
)
(
x
2
+
9
)
d)
(
x
−
9
)
(
x
+
9
)
(x-9)(x+9)
(
x
−
9
)
(
x
+
9
)
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