Consider the ellipse (x^2)/(f(k^2+2k+5))...

Consider the ellipse `(x^2)/(f(k^2+2k+5))+(y^2)/(f(k+11))=1.` If `f(x)` is a positive decreasing function, then (a)the set of values of `k` for which the major axis is the x-axis is `(-3,2)dot` (b)the set of values of `k` for which the major axis is the y-axis is `(-oo,2)dot` (c)the set of values of `k` for which the major axis is the y-axis is `(-oo,-3)uu(2,oo)` (d)the set of values of `k` for which the major axis is the y-axis is `(-3,-oo,)`

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