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IBPS RRBs Officer Scale I 06 Sep 2015 Paper
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© examsnet.com
Question : 48
Total: 200
I.
25
x
2
+
25
x
+
4
=
0
II.
5
y
2
+
11
y
+
6
=
0
1
2
3
4
5
Validate
Solution:
(2)
I.
25
x
2
+
25
x
+
4
=
0
⇒
25
x
2
+
20
x
+
5
x
+
4
=
0
⇒ 5x (5x + 4) + 1 (5x + 4) = 0
⇒ (5x + 4) (5x + 1) = 0
⇒ x =
−
45
or -
15
II.
5
y
2
+
11
y
+
6
=
0
⇒
5
y
2
+
5
y
+
6
y
+
6
=
0
⇒ 5y (y + 1) + 6 (y + 1) = 0
⇒ (y + 1) (5y + 6) = 0
V y = – 1 or
−
65
Clearly, x > y
© examsnet.com
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