The exercise says that I should find "real zeros" of the following function:
$$f(x)=7-2x^2+2^{-x}$$
I have tried several ways, but I keep getting stuck as I take log-s of both sides. Can I solve this equation manually, somehow, not in a very complicated way?
(I suspect, it shouldn't be very hard, since it's in the introductory chapter of the calculus book :/)