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<?php
$a = $_POST['a'];
$b = $_POST['b'];
$c = $_POST['c'];
$d = $b*$b - 4.0*$a*$c;
if ($d>0)
{
$x = (-$b + sqrt( $d ) ) / ( 2.00 * $a );
$y = (-$b - sqrt( $d ) ) / ( 2.0 * $a );
print("The roots are: $x, $y");
}
else if ($d==0)
{ $x = (-$b + sqrt( $d ) ) / ( 2.0 * $a);
print("The root is: $x");
}
else
print("No real root.");
?>