Let f be a strictly decreasing function defined on R such that f(x)>0, \forall x \in R. Let \frac{x^2}{f (a^2+5 a+3) }+\frac{y^2}{f(a+15)}=1 be an ellipse with major axis along the y-axis. The value of 'a' can lie in the interval (s)

WBJEE 2023 Math Solved Paper

Question : 72 of 75

Marks: +1, -0

Let f be a strictly decreasing function defined on R such that f(x)>0,∀x∈R. Let ‌

f(a2+5a+3)

+‌

f(a+15)

=1 be an ellipse with major axis along the y-axis. The value of 'a' can lie in the interval (s)

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