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Test Index
RRB Assistant Loco Pilot and Technician Model Paper 6 for online practice
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Question : 2
Total: 75
x
2
−
y
2
4
x
y
x
2
−
y
2
x
y
x
2
+
y
2
2
x
y
0
Validate
Solution:
∵ p = x + y and q = x – y
∴
p
+
q
p
−
q
−
p
−
q
p
+
q
=
(
p
2
+
2
p
q
+
q
2
)
−
(
p
2
−
2
p
q
+
q
2
)
p
2
−
q
2
=
4
p
q
p
2
−
q
2
=
4
(
x
+
y
)
(
x
−
y
)
(
x
+
y
)
2
−
(
x
−
y
)
2
=
4
(
x
2
−
y
2
)
x
2
+
2
x
y
+
y
2
−
x
2
+
2
x
y
−
y
2
=
x
2
−
y
2
x
y
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