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IBPS RRBs Officer Scale I 06 Sep 2015 Paper
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© examsnet.com
Question : 49
Total: 200
I.
2
x
2
+
x
–
1
=
0
II.
2
y
2
+
y
–
6
=
0
1
2
3
4
5
Validate
Solution:
(5)
I.
2
x
2
+
x
–
1
=
0
⇒
2
x
2
+
2
x
–
x
–
1
=
0
⇒ 2x (x + 1) – 1 (x + 1) = 0
⇒(2x – 1) (x + 1) = 0
⇒ x =
12
or –1
II.
2
y
2
+
y
–
6
=
0
⇒
2
y
2
+
4
y
–
3
y
–
6
=
0
⇒ 2y (y + 2) – 3 (y + 2) = 0
⇒(2y – 3) (y + 2) = 0
⇒ y =
32
or – 2
© examsnet.com
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