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SSC Multi Tasking Model Paper 5
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© examsnet.com
Question : 45
Total: 148
If x
2
+ y
2
+ z
2
+ 2 = 2(y − x), then what will be the value of 3x + 5y + 6z?
2
0
1
4
Validate
Solution:
ATQ,
x
2
+
1
+
2
x
+
y
2
+
1
−
2
y
+
z
2
=
0
(
x
+
1
)
2
+
(
y
−
1
)
2
+
z
2
=
0
∴ x = − 1, y = 1, z = 0
Put the above value in equation-
3x + 5y + 6z = 3 × − 1 + 5 × 1 + 6 × 0
= − 3 + 5 = 2
© examsnet.com
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