The values can only be added or subtracted if there are like-terms in the expression.  Since there are no like-terms in the question, the question is already simplified as is.  All the other answers given are incorrect.

There are multiple operations required in this problem.  The exponent must be eliminated before distributing the negative sign.  Use the FOIL method which means to mulitply the first terms together, then multiply the outer terms together, then multiply the inner terms togethers, and lastly, mulitply the last terms together.

The negative sign can now be distributed.

First, find the common denominator, which is . Then, make sure to offset each numerator. Multiply by y to get . Multiply by x to get . Then, combine numerators to get . Then, put the numerator over the denominator to get your answer: .

Make a common denominator:

Combine and subtract numerators:

To start this problem, you must first identify the common denominator, which in this case is teh two denominators multiplied together: . Next, offset the numerators with the newly changed denominators: . Then, add numerators to get: . Put the numerator over your denominator and check to make sure it can't be simplified anymore (it can't). Your answer is: .

To combine these rational expressions, first find the common denominator. In this case, it is . Then, offset the second equation so that you get the correct denominator: . Then, combine the numerators: . Put your numerator over the denominator for your answer: .

First find the lowest common denominator. In this case, it will be x(x+2).

Multiply each fraction to get the common denominator then solve:

To be able add or subtract the numerator, the denominators must be the same.

To get the same denominator, multiply both uncommon denominators together.

Convert both fractions to the like denominator.

For the numerator of the first term, expand the binomials.

Evaluate the numerator of the second term.

Rewrite the fractions.

To combine the numerators as one fraction, enclose the numerator of the second term in parentheses.

Simplify the numerator by distributing the negative sign and combine like-terms.

There are no similar common factors that will help reduce this expression any further.

The answer is:  

In order to solve this rational expression, denominators must be common.

Multiply both denominators together.

Convert the fractions with the same base denominator.  Multiply the numerator with what was multiplied on the denominator to achieve the new denominator.

Combine the two fractions into a single fraction.

Simplify the numerator on the right side.

The answer is:  

Rewrite the fractions with the least common denominator.  The least common denominator is .  We will need both fractions to have this denominator in order to add or subtract the numerator.

Distribute the numerator and denominator of the first term.

Combine the numerators as one fraction.  Be sure to enclose the second term in parentheses.

Simplify the numerator.

There are no common factors.

The answer is: