Explain how addition and subtraction of rational expressions is similar to and different from addition and subtraction of rational numbers.
Choose the correct answer below.
O A. When subtracting rational expressions, the resulting denominator is the ratio of the original denominators, whereas when subtracting rational numbers, the
difference is obtained by adding the negative and the resulting denominator is the LCM of the original denominators.
O B. The process of adding both rational numbers and rational expressions involves factoring the donorninators to identify the LCM of the original denominators
and then rewriting the fractions with the LCM as the denominator. The process of factoring a rational expression's polynomial denominator is similar but
more complex than the process for factoring the integer denominator of a rational number.
OC. When adding rational expressions, the rational expressions are rewritten with a common denominator and the numerators are added. However, when
adding rational numbers, the numerators are added and the denominators are multiplied.
OD. When adding rational expressions, the rational expressions are rewritten with a common denominator and the numerators are added. However, when
adding rational numbers, the numerators are added and the denominators are not changed. The resulting rational expression does not need to be simplified
whereas a rational number is always simplified until the numerator and denominator have no common