// lets see if I can do a quadradic formula
function decodeMessage (form) {
var a = form.a.value ? form.a.value : 1;
var b = form.b.value ? form.b.value : 1;
var c = form.c.value ? form.c.value : 1;
var root1 = 0;
var root2 = 0;
var sqrt = (b*b)-(4*a*c);
_gel('content_div').innerHTML = "";
//_gel('content_div').innerHTML += "sqrt = " + sqrt + "
";
if (sqrt >= 0) {
root1 = (-b+Math.sqrt(sqrt)) / (2*a);
root2 = (-b-Math.sqrt(sqrt)) / (2*a);
_gel('content_div').innerHTML += "The roots are: " + root1 + " and " + root2 + "
";
if (a != 1)
_gel('content_div').innerHTML += a + "x2 + ";
else
_gel('content_div').innerHTML += "x2 + ";
if (b != 1)
_gel('content_div').innerHTML += b + "x + ";
else
_gel('content_div').innerHTML += " x + ";
_gel('content_div').innerHTML += c + "";
_gel('content_div').innerHTML += " = " + "(x + " + -root1 + ")( x + " + -root2 + ")";
} else {
root1 = "(" + (-b/(2*a)) + " + " + Math.sqrt(-sqrt)/(2*a) + "i)";
root2 = "(" + (-b/(2*a)) + " - " + Math.sqrt(-sqrt)/(2*a) + "i)";
_gel('content_div').innerHTML += "The roots are imaginary:
" + root1 + "
" + root2 + "
";
}
}
Try to find the roots for any quadradic equation.
]]>