Question

the domain of the function:
f(x)=
$\sqrt( ({2x - 1}) \div (x + 3) )$

Answer 1

your answer is given above i am glad to help you..

Answer 2

I have recently started using LateX, and I am beginning to use pgf/tikz to create plots. But I have encountered some problems with the functions stated above. I can plot the function f(x)=x^3, but when I try to add 5*x^2 to the function, it gives an error when compiled. The same happens, when i try to plot x^4 and sqrt(x). An exampe if this:

\documentclass{article}
\usepackage{pgfplots}
\usepackage{pgf,tikz}
\usetikzlibrary{arrows}
\usepackage{tikz}
\usepackage [hmargin=2cm,vmargin=3cm]{geometry}
\begin{document}
\definecolor{ttqqqq}{rgb}{0.2,0,0}
\definecolor{wqwqwq}{rgb