JavaScript Source Code 2002: Calculators: Parabola Grapher

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Parabola Grapher

Enter a parabolic equation, like 5x^2 + 18x + 27 and this calculator will determine all the vital information about the graph. And, a rough graph of the curve is available. I wish I know about JavaScript back in high school....

Quick Download of Parabola Images:
../img/parabola-grapher/parabola-grapher.zip

JavaScript Source Code 2002: Calculators: Parabola Grapher
Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s). The script is yours!!!

  <HEAD> <SCRIPT LANGUAGE="JavaScript">  <! > <! >  </script> </HEAD>  <BODY> <center> <form> <table bgcolor="#C0C0C0" cellspacing=2 cellpadding=2 border=3> <tr> <td> <b> <h3>Parabolic Calculator</h3> <input name="a" size="3">X<sup>2</sup>+ <input name="b" size="3">X + <input name="c" size="3"> <br> <input type="button" value="x-top" name="x-top" onclick="xtop(this.form)"> <input type="button" value="y-top" name="y-top" onclick="ytop(this.form)"> <input type="button" value="crd" name="crd" onclick="doCoord(this.form)"> <input type="button" value="disc." name="D" onclick="disc(this.form)"> <br> <input type="button" value="0-points" name="zeroes" onclick="zeroes1(this.form);zeroes2(this.form)"> <input type="button" onclick="xtop(this.form);ytop(this.form);doCoord(this.form);disc(this.form);zeroes1(this.form);zeroes2(this.form)" value="do all"> <input 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."> <br> <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="form.rem.value=form.co.value"> 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> </b> </td> <td><img src="p1.gif" width=200 name="p" height=200 border=0 alt=""></td> </tr> </table> </form> </center>