I believe the problem with my code here is that for some reason, on the equation for VertY.. it is being treated as a string.. I want it to be a math equation, but it treats it as text. (ie -1 + 1 should be 0, but it says it is -11)

I believe this is the problem code:

form.VertY.value = ((a * (form.VertX.value * form.VertX.value)) + (b * form.VertX.value) + (c))

I believe this is the problem code:

form.VertY.value = ((a * (form.VertX.value * form.VertX.value)) + (b * form.VertX.value) + (c))

Code:

<html> <head> <title>Untitled</title> </head> <script type="text/javascript"> function quad(form) { a = form.a.value b = form.b.value c = form.c.value form.Dis.value = (b * b) - (4 * a * c) form.VertX.value = (-b) / (2 * a) form.VertY.value = ((a * (form.VertX.value * form.VertX.value)) + (b * form.VertX.value) + (c)) if (a == 0) { alert("ERROR, EQUATION MUST BE QUADRATIC") } else { if (form.Dis.value > 0) { form.NumSol.value = 2; form.SolOne.value = ((-b) + Math.sqrt(form.Dis.value)) / (2 * a) form.SolTwo.value = ((-b) - Math.sqrt(form.Dis.value)) / (2 * a) } else if (form.Dis.value == 0) { form.NumSol.value = 1; if (((-b) - Math.sqrt(form.Dis.value)) == 0) { form.SolOne.value = ((-b) - Math.sqrt(form.Dis.value)) / (2 * a) form.SolTwo.value = "NO SOLUTION" } else { form.SolOne.value = ((-b) + Math.sqrt(form.Dis.value)) / (2 * a) form.SolTwo.value = "NO SOLUTION" } } else { form.NumSol.value = 0; form.SolOne.value = "NO SOLUTION" form.SolTwo.value = "NO SOLUTION" } } if (a > 0) { form.Open.value = "Up" } else { form.Open.value = "Down" } } </script> <body> <form name="form1"> <table border="2" align=center> <center> <tr> <td align=center valign=middle><input type="text" name="a" size=3> x^2 + <input type="text" name="b" size=3> x + <input type="text" name="c" size=3> </td> </tr> <tr><td align=center valign=middle> <input type="button" value="Calculate" onClick="quad(this.form)"> </td></tr> <tr><td align=center valign=middle>Discriminant: <input type="text" name="Dis" size = 7 /></td></tr> <tr><td align=center valign=middle>Number of Solutions: <input type="text" name="NumSol" size = 2 /></td></tr> <tr><td align=center valign=middle><b>Solution 1: </b><input type="text" name="SolOne" size = 10 style="font-weight:bold;" /></td></tr> <tr><td align=center valign=middle><b>Solution 2: </b><input type="text" name="SolTwo" size = 10 style="font-weight:bold;" /></td></tr> <tr><td align=center valign=middle>Your graph will open: <input type="text" name="Open" size = 4 /></td></tr> <tr><td align=center valign=middle> Vertex: ( <input type="text" name="VertX" size = 2 /> , <input type="text" name="VertY" size = 2 /> ) </td></tr> </table> </form> </center> </body> </html>

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