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Parabola Grapher

Calculators >>> Parabola Grapher.

Enter a parabolic equation, like 5x^2 + 18x + 27 and this Parabola calculator will determine all the vital information about the graph. And, a rough graph of the curve is available.

Parabolic Calculator

X2+ X +

neg zero pt.
pos zero pt.

Step 1: Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
var a, b, c;
function xtop(form) {
form.u.value = (form.b.value * -1) / (form.a.value * 2);
function ytop(form) {
form.u2.value = -1 * (form.b.value * form.b.value) / (4 * form.a.value) - (-1 * form.c.value);
function doCoord(form) { = form.u.value + "," + form.u2.value;
function disc(form) {
form.o.value = (form.b.value * form.b.value) - (form.a.value * form.c.value * 4);
function zeroes1(form) {
form.n.value = ((form.b.value * -1) - (Math.sqrt(form.o.value))) / (form.a.value * 2);
function zeroes2(form) {
form.n2.value = ((form.b.value * -1) - (-1 * Math.sqrt(form.o.value))) / (form.a.value * 2);
function move_in(img_name,img_src) {
//  End -->
<table bgcolor="#C0C0C0" cellspacing=2 cellpadding=2 border=3>
h3>Parabolic Calculator</h3>
<input name="a" size="3">X<sup>2</sup>+
<input name="b" size="3">X +
<input name="c" size="3">
<input type="button" value="x-top" name="x-top" onclick="xtop(this.form)">
type="button" value="y-top" name="y-top" onclick="ytop(this.form)">
type="button" value="crd" name="crd" onclick="doCoord(this.form)">
type="button" value="disc." name="D" onclick="disc(this.form)">
<input type="button" value="0-points" name="zeroes" onclick="zeroes1(this.form);zeroes2(this.form)">
type="button" onclick="xtop(this.form);ytop(this.form);doCoord(this.form);disc(this.form);zeroes1(this.form);zeroes2(this.form)" value="do all">
type="button" name="pics" value="show e.g." onClick="if(form.a.value>0 && form.o.value>0)move_in('p','p2.gif');if (form.a.value<0 && form.o.value>0)move_in('p','p3.gif'); if(form.a.value>0 && form.o.value==0) move_in('p','p4.gif'); if(form.a.value<0 && form.o.value==0) move_in('p','p5.gif'); if(form.a.value>0 && form.o.value<0) move_in('p','p6.gif'); if(form.a.value<0 && form.o.value<0) move_in('p','p7.gif')" value="show e.g.">
<input type="text" name="u" size="8"> x-top<br>
<input type="text" name="u2" size="8"> y-top<br>
<input type="text" size="8" name="co" onmouseover=""> Coord.<br>
<input type="text" size="8" name="o"> Discriminant<br>
<input type="text" size="8" name="n"> neg zero pt.<br>
<input type="text" size="8" name="n2"> pos zero pt.
<input type="hidden" value="" name="rem"><br>
<input type="reset" value="reset"><br>
<img src="p1.gif" width=200 name="p" height=200 border=0 alt=""></td>

Step 2: The script uses 7 images as part of its interface. You can create your own, or use the 7 below (resized for easier download):

(right click images, and select "Save Image As")
Upload them into the same directory as your webpage.

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