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WBJEE 2014 Maths Solved Paper
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© examsnet.com
Question : 50
Total: 80
The values of λ for which the curve
(
7
x
+
5
)
2
+
(
7
y
+
3
)
2
=
λ
2
(
4
x
+
3
y
–
24
)
2
represents a parabola is
±
6
5
±
7
5
±
1
5
±
2
5
Validate
Solution:
49 [
(
x
+
5
7
)
2
+
(
y
+
3
7
)
2
] = 25
λ
2
(
4
x
+
3
y
−
24
5
)
2
⇒
25
λ
2
19
= 1
⇒
λ
2
=
49
25
λ = ±
7
5
© examsnet.com
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