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Mathematics
Problem
The polynomial
x
3
+
2
x
2
−
x
−
2
x^{3}+2x^{2}-x-2
x
3
+
2
x
2
−
x
−
2
can be factorised as a)
(
x
+
2
)
(
x
2
+
1
)
(x+2)(x^{2}+1)
(
x
+
2
)
(
x
2
+
1
)
b)
(
x
−
1
)
(
x
2
+
2
)
(x-1)(x^{2}+2)
(
x
−
1
)
(
x
2
+
2
)
c)
(
x
+
2
)
(
x
2
−
1
)
(x+2)(x^{2}-1)
(
x
+
2
)
(
x
2
−
1
)
d)
(
x
−
2
)
(
x
2
+
1
)
(x-2)(x^{2}+1)
(
x
−
2
)
(
x
2
+
1
)
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