You can use this formal method of calculating the LCD with numbers as well¬just use prime factorizations of the numbers. The list of factors and powers you generated is the LCD.The power of each factor in that list should be the highest power that factor is raised to in any denominator.Make a list that contains one copy of each factor, all multiplied together.Factor all denominator polynomials completely.To calculate an LCD for a rational function, follow these steps: Actually, if given the choice, I'd prefer not going at all, since (from afar) my dance technique looks like someone walking into an electrified fence. There's nothing wrong with going informal if a fraction contains only numbers, but if you spot variables, you have to get all gussied up with the formal method. Both keep you clothed, but neither is appropriate in all circumstances¬it depends upon the kind of dance you're going to. If finding an LCD is like going to a dance, then consider this method your dressy suit pants, while the Bubba technique is a well-worn pair of jeans. Unfortunately, the Bubba technique I described to calculate the LCD doesn't work once variables get tossed into the mix, so you'll need to use a more formal method.
Since (once the fancy talking has been stripped away) rational expressions are just plain old fractions, adding or subtracting them will still require you to find a least common denominator (LCD).
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