So the question:

is 1/r > r/(r^2+2)?

The actual answer is, "we don't have enough info." according to the book, but can't we cross multiply, giving us:

r^2+2 > r^2

Whichwouldbe true in all cases, isn't it?

We supposedly would have enough infoifwe knew also knew that r>0, but what difference will that make? Squaring anything would make r^2 a positive number anyway, right?

Can anyone tell me what I'm missing here? :confused: