The least common denominator would be 2x^2 that is because you would have to multiply the first fraction by 2x but you can't just somehow simplify 2x^2, it wouldn't be right 4/x * -4/2x^2 2x*4/(2x*x) * -4/2x^2 8x /2x^2 * -4/2x^2 Then you would complete it
