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IBPS RRBs Officer Scale I 06 Sep 2015 Paper
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© examsnet.com
Question : 50
Total: 200
I.
x
2
–
10
x
+
21
=
0
II.
y
2
–
16
y
+
63
=
0
1
2
3
4
5
Validate
Solution:
(3)
I.
x
2
–
10
x
+
21
=
0
⇒
x
2
–
7
x
–
3
x
+
21
=
0
⇒ x (x – 7) – 3 (x – 7) = 0
⇒ (x – 3) (x – 7) = 0
⇒ x = 3 or 7
II.
y
2
–
16
y
+
63
=
0
⇒
y
2
–
9
y
–
7
y
+
63
=
0
⇒ y (y – 9) – 7 (y – 9) = 0
⇒ (y – 7) (y – 9) = 0
⇒ y = 7 or 9
Clearly, x ≤ y
© examsnet.com
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