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Byju's Answer
Standard VIII
Mathematics
Expansion of (x+a)(x+b)
Expand x+4x-1...
Question
Expand
(
x
+
4
)
(
x
−
11
)
.
A
x
2
−
7
x
−
44
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B
x
2
+
7
x
+
44
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C
x
2
+
7
x
−
44
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D
x
2
−
7
x
+
44
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Solution
The correct option is
A
x
2
−
7
x
−
44
Using the identity,
(
x
+
a
)
(
x
−
b
)
=
x
2
+
(
a
−
b
)
x
−
a
b
(
x
+
4
)
(
x
−
11
)
=
x
2
+
(
4
−
11
)
x
−
(
4
)
(
11
)
=
x
2
−
7
x
−
44
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Q.
Expand
(
x
−
4
)
(
x
+
4
)
(
x
−
3
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(
x
+
3
)
Q.
expand : (6x +11) (6x -11)
Q.
Inverse of the statement "If
4
x
−
1
=
11
, then
x
=
3
"
Q.
Expand
(
x
−
2
)
2
using suitable identity.
Q.
Expand :
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+
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)
(
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−
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)
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