#!/usr/bin/env perl
use strict;
use warnings;

use Math::Complex;


sub quad {
    my ($a, $b, $c) = @_;
    my $positive = (
        ($b * -1) - sqrt(($b ** 2) - (4 * ($a * $c))) / (2 * $a)
    );
    my $negative = (
        ($b * -1) + sqrt(($b ** 2) - (4 * ($a * $c))) / (2 * $a)
    );

    return ($positive, $negative);
}


my @xx0 = quad(1, 2, 3);
printf("%s, %s\n", $xx0[0], $xx0[1]);

my @xx1 = quad(4, 5, 6);
printf("%s, %s\n", $xx1[0], $xx1[1]);

my @xx2 = quad(7, 8, 9);
printf("%s, %s\n", $xx2[0], $xx2[1]);


1;
__END__