Having been introduced to the basics, there are two techniques you
can learn now. The first is called windowing, and has been
mentioned briefly in chapter ![[*]](crossref.gif){kind=small}
. It is a tool
that helps you work with images faster, and work with equations that
are larger than you can easily visualize. The second technique is
called correspondence. You will use this simple concept and
skill when solving quadratic equations, using expressions with exponents
and logs, and other situations.