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CAT 2016 Question Paper Quantitative Ability for online practice
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© examsnet.com
Question : 3
Total: 34
If ‘a’ and ‘b’ are the roots of the equation
x
2
+
7
x
+
4
=
0
,
where a > b, then find the value of
(
2
7
a
)
+
(
1
3.5
b
)
+
a
b
7
2
14
3
−
7
2
2
7
Validate
Solution:
As ‘a’ and ‘b’ are the roots of the given equation,
a + b = -7
ab = 4
The given expression can be rewritten as
2
7
(
a
+
b
a
b
)
+
a
b
=
2
7
(
−
7
4
)
+
4
=
7
2
© examsnet.com
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