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Mathematics
Mathematics
Problem
Factorise
x
4
−
5
x
2
+
4
x^4 - 5x^2 + 4
x
4
−
5
x
2
+
4
completely over the real numbers. a)
(
x
2
−
1
)
(
x
2
−
4
)
(x^2-1)(x^2-4)
(
x
2
−
1
)
(
x
2
−
4
)
b)
(
x
−
1
)
(
x
+
1
)
(
x
−
2
)
(
x
+
2
)
(x-1)(x+1)(x-2)(x+2)
(
x
−
1
)
(
x
+
1
)
(
x
−
2
)
(
x
+
2
)
c)
(
x
2
+
1
)
(
x
2
−
4
)
(x^2+1)(x^2-4)
(
x
2
+
1
)
(
x
2
−
4
)
d)
(
x
2
−
2
)
2
(x^2-2)^2
(
x
2
−
2
)
2
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