how does my calculator graph ($\sqrt { -x}$. Since I can't graph a complex number, how does my calculator graph the $\sqrt { -x}$ ?
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How does the graph from your calculator look like? (Compared to this) If no complex numbers are involved, you'd only consider values $x$ for which $\sqrt{-x}$ is real, i.e. only $x\leq0$ – Roland Feb 06 '14 at 08:27
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If $x$ is real, plot you function betwen minus something and zero. – Claude Leibovici Feb 06 '14 at 08:27
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Hint: $-x$ can be positive for some values of $x$. – Martín-Blas Pérez Pinilla Feb 06 '14 at 08:30
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It is not hard to see that. First of all, we have $-x\geq 0$ and so the domain equals negatives real numbers. Consider $-1,-4,-9,-16\ldots$ and it implies that $1,2,3,4,\ldots$. "It is sufficient that you consider $\sqrt x$, then repalce $x\rightarrow -x$"
Bobby
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