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Other
Quantitative Aptitude
Equations
If the value ...
Question
If the value of
2
x
3
−
2
x
2
−
x
−
a
equals to
5
, when
x
=
2
, then the value of
′
a
′
is _________.
A
4
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B
1
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C
3
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D
6
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Solution
The correct option is
B
1
Given,
f
(
x
)
=
2
x
3
−
2
x
2
−
x
−
a
When
x
=
2
f
(
2
)
=
2
(
2
3
)
−
2
(
2
2
)
−
2
−
a
=
5
Putting values in given expression
f
(
2
)
=
2
×
2
3
−
2
×
2
2
−
2
−
a
=
5
⇒
16
−
8
−
2
−
a
=
5
⇒
6
−
a
=
5
⇒
a
=
1
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0
Similar questions
Q.
When
x
=
3
+
5
√
−
1
2
, find the value of
2
x
3
+
2
x
2
−
7
x
+
72
; and show that it will be unaltered if
3
−
5
√
−
1
2
be substituted for
x
.
Q.
Find the value of a, if the value of
2
x
2
+
x
−
a
equals to 5, when x=0?
Q.
Find the value of the expression
2
x
3
+
2
x
2
−
7
x
+
72
where
x
=
3
+
5
√
1
2
.
Q.
What should be the value of 'a' if the value of
2
x
2
+
x
−
a
equals to 5, when x = 0?
Q.
If
2
x
2
+
3
x
+
4
(
x
−
1
)
(
x
2
+
2
)
=
A
x
−
1
+
B
x
+
C
x
2
+
2
Then the value of
B
is equal to
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