General ⇒ Problem of position of equation

[pallav]

I always write equations with eqnarray, for example,

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\begin{eqnarray}
ax^2+by^2+c=0
\end{eqnarray}

It automatically take the equation number but the position of the equation is at the center of a line. But sometimes, I have to write the equation to the left (or right) of a page, obvioutly by using eqnarray (& nothing else). How it is possible?

[frabjous]

The eqnarray environment is obsolete and should no longer be used. See l2tabu for discussion of this. Use align environment or other environment provided by amsmath.

The fleqn option to your document class will left-align all equations by default. If you only want some of them that way, you can use the nccmath package from the ncctools bundle which provides an fleqn environment to left-align some equations rather than others:

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\documentclass{article}
\usepackage{amsmath}
\usepackage{nccmath}
\begin{document}
    \begin{fleqn}
        \begin{align}
            2+2=4 % this will be left aligned
        \end{align}
    \end{fleqn}
    \begin{align}
        3+5=8 % this will be centered
    \end{align}
\end{document}