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Byju's Answer
Standard XII
Mathematics
Range of Quadratic Expression
Number of sol...
Question
Number of solutions of the equations
|
2
x
2
+
x
−
1
|
=
|
x
2
+
4
x
+
1
|
.
A
1
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B
2
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C
3
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D
4
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Solution
The correct option is
D
4
∣
∣
2
x
2
+
x
−
1
∣
∣
=
∣
∣
x
2
+
4
x
+
1
∣
∣
2
x
2
+
x
−
1
=
−
(
x
2
−
4
x
+
1
)
3
x
2
−
5
x
=
0
x
(
3
x
−
5
)
=
0
x
=
0
o
r
5
3
or
2
x
2
+
x
−
1
=
x
2
+
4
x
+
1
x
2
−
3
x
−
2
=
0
x
=
3
±
√
9
+
8
2
x
=
3
+
√
17
2
,
3
−
√
17
2
∴
answer is
4
Suggest Corrections
0
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