[Tex/LaTex] Write Equations side by side

Question

My Code:

\documentclass[12pt,a4paper]{article}
\usepackage[a4paper,vmargin=0.7in,hmargin=0.7in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[misc]{ifsym}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{array,booktabs}
\usepackage{parskip}
\begin{document}
    \large
    \begin{eqnarray*}
        x &=& \dfrac{a+\sqrt{a^2-4b}}{2}\\
        &=& \dfrac{5+\sqrt{1}}{2}\\
        &=& \dfrac{5+1}{2}\\
        &=& 3
    \end{eqnarray*}
    \begin{eqnarray*}
        y &=& \dfrac{a-\sqrt{a^2-4b}}{2}\\
        &=& \dfrac{5-\sqrt{1}}{2}\\
        &=& \dfrac{5-1}{2}\\
        &=& 2
    \end{eqnarray*}

\end{document}

Hi
I need to write above both equations side by side that is horizontally.

Answer 1

Use align* instead, like so:

\documentclass[12pt,a4paper]{article}
\usepackage[a4paper,vmargin=0.7in,hmargin=0.7in]{geometry}
\usepackage[utf8]{inputenc}
\usepackage[misc]{ifsym}
\usepackage{amsmath,amsfonts,amssymb}
\usepackage{array,booktabs}
\usepackage{parskip}
\begin{document}
\begin{align*}
 x_1 &= \dfrac{a+\sqrt{a^2-4b}}{2} & x_2 &= \dfrac{a-\sqrt{a^2-4b}}{2} \\
     &= \dfrac{5+\sqrt{1}}{2}      &     &= \dfrac{5-\sqrt{1}}{2} \\
     &= \dfrac{5+1}{2}             &     &= \dfrac{5-1}{2} \\
     &= 3                          &     &=2
\end{align*}

\end{document}