The Soda Pop

Phương trình bậc hai AX² + BX + C = 0
A = B = C =	X1 = X2 =

<SCRIPT LANGUAGE="JavaScript"> <!-- Begin function quad(form) { a=eval(form.a.value); b=eval(form.b.value); c=eval(form.c.value); x1=-b/2/a+Math.pow(Math.pow(b,2)-4*a*c,0.5)/2/a; x2=-b/2/a-Math.pow(Math.pow(b,2)-4*a*c,0.5)/2/a; form.x1.value = x1; form.x2.value = x2; if (form.x1.value == "NaN") form.x1.value="Phương trình này vô nghiệm"; if (form.x2.value == "NaN") form.x2.value="Phương trình này vô nghiệm"; } // End --> </SCRIPT> <center> <form name=form> <table border=1 cellpadding=2> <tr> <td colspan=2 align=center><b>Phương trình bậc hai<br>AX² + BX + C = 0</b></td> </tr> <tr> <td> <center><table border=1 width=100% cellpadding=2> <tr> <td align=center><b>A = </b></td> <td align=center><input type=text size=6 name="a"></td> </tr> <tr> <td align=center><b>B = </b></td> <td align=center><input type=text size=6 name="b"></td> </tr> <tr> <td align=center><b>C = </b></td> <td align=center><input type=text size=6 name="c"></td> </tr> </table> </td> <td> <center><table border=1 width=100% cellpadding=2> <tr> <td colspan=2 align=center> <input type=button value="Giải" onClick="quad(this.form)"></td> </tr> <tr> <td align=center><b>X1 = </b></td> <td align=center><input type=text size=6 name="x1"></td> </tr> <tr> <td align=center><b>X2 = </b></td> <td align=center><input type=text size=6 name="x2"></td> </tr> </table> </td> </tr> </table> </form> </center>