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f(x) = log2(x^4+a). Let P be the set of ...

`f(x) = log_2(x^4+a)`. Let P be the set of values of of a for which for which f(x) is defined `AA x in R & Q` be the set of values of of `a` for which ` f(x)` attains all real values, then the number of element in `P nnQ` is

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