Re: Which expression is defined for all real numbers?
Originally Posted by Plato
Please use grouping symbols
Is choice 4) $\dfrac{7}{x^2}+3$ that is what you posted.
Or is it $\dfrac{7}{x^2+3}$
It must be the latter for choice 4) to look like that for this problem to have an answer, and I suspect that choice 1)
had been intended as (x + 3)/x^2, given that choice 4) is missing the required parentheses, even though it would
not change the answer choice.