# Algebra II : Properties of Fractions

## Example Questions

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### Example Question #1 : Properties Of Fractions

Find the values of  which will make the given rational expression undefined:

Explanation:

If or , the denominator is 0, which makes the expression undefined.

This happens when x = 1 or when x = -2.

Therefore the correct answer is .

### Example Question #2 : Properties Of Fractions

Simply the expression:

Explanation:

In order to simplify the expression , we need to ensure that both terms have the same denominator. In order to do so, find the Least Common Denominator (LCD) for both terms and simplify the expression accordingly:

### Example Question #3 : Properties Of Fractions

Simply the expression:

Explanation:

In order to simplify the expression , first note that the denominators in both terms share a factor:

Find the Least Common Denominator (LCD) of both terms, and then simplify the expression:

### Example Question #4 : Properties Of Fractions

Simplify the expression:

Explanation:

In order to simplify the expression  , first note that the denominators in both terms share a factor:

Find the Least Common Denominator (LCD) of both terms:

Finally, combine like terms:

### Example Question #5 : Properties Of Fractions

Simplify the expression:

Explanation:

1. Create a common denominator between the two fractions.

2. Simplify.

### Example Question #6 : Properties Of Fractions

Find the values of  which will make this rational expression undefined:

Explanation:

For a rational expression to be undefined, the denominator must be equal to .

1. Set the denominator equal to .

2. Set the factors equal to  and solve for .

and

### Example Question #11 : Rational Expressions

Which value of  makes the following expression undefined?

Explanation:

A rational expression is undefined when the denominator is zero.

The denominator is zero when .

### Example Question #7 : Properties Of Fractions

Compute:

Explanation:

The terms cannot be added unless the denominators are common.  To get the same denominator for each term, find the LCD by multiplying , and .

The denominator for the three terms are .  Evaluate each term of the given problem.

### Example Question #8 : Properties Of Fractions

Bob is left with a whole pizza for dinner.  He eats  of this pizza.   Afterward, Wendy eats the rest of the pizza except the crusts, and leaves  of the whole pizza remaining.  What fraction did Wendy eat?

Explanation:

A whole pizza is one unit.

After Bob ate  of this pizza,  will remain.

Wendy eats an  amount of the two-thirds of the pizza, and leaves  of the whole pizza.  Write the equation and solve for .

### Example Question #14 : Rational Expressions

Simplify, if possible:

Explanation:

In order to subtract the numerators, first find the least common denominator in the problem.  This can usually be found by multiplying the unlike denominators together.

For each term, multiply the numerator with what was multiplied on the denominator to get the least common denominator.

Simplify.

There are no other terms or common factors here that can be simplified.  Since there are no like terms in the numerator or denominator, this is fully simplified.