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Mathematics
Problem
Factor the quadratic polynomial
x
2
−
x
−
20
x^2 - x - 20
x
2
−
x
−
20
. Which of the following is its correct factorisation? a)
(
x
+
4
)
(
x
+
5
)
(x + 4)(x + 5)
(
x
+
4
)
(
x
+
5
)
b)
(
x
−
10
)
(
x
+
2
)
(x - 10)(x + 2)
(
x
−
10
)
(
x
+
2
)
c)
(
x
+
4
)
(
x
−
5
)
(x + 4)(x - 5)
(
x
+
4
)
(
x
−
5
)
d)
(
x
−
4
)
(
x
+
5
)
(x - 4)(x + 5)
(
x
−
4
)
(
x
+
5
)
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