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Byju's Answer
Standard VIII
Mathematics
Factorisation Using Algebraic Identities
Factorise: ...
Question
Factorise:
x
2
+
6
x
+
8
A
(
x
+
8
)
(
x
+
1
)
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B
(
x
+
3
)
(
x
+
5
)
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C
(
x
−
4
)
(
x
−
2
)
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D
(
x
+
4
)
(
x
+
2
)
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Solution
The correct option is
B
(
x
+
4
)
(
x
+
2
)
We need to find two integers whose product is
8
and sum is
6
.
The factors are
4
and
2
.
∴
x
2
+
6
x
+
8
=
x
2
+
4
x
+
2
x
+
8
=
x
(
x
+
4
)
+
2
(
x
+
4
)
=
(
x
+
4
)
(
x
+
2
)
Suggest Corrections
1
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