hello

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``` java
public class a{
    public static void main(String[] args)
    {
        System.out.println("Hello, world!");
    }
}
def show(name)
  puts "hi, #{name}"
end
```

public class a{
    public static void main(String[] args)
    {
        System.out.println("Hello, world!");
    }
}

When $a \ne 0$, there are two solutions to (ax^2 + bx + c = 0) and they are \(x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\)