## How do you find restrictions when dividing rational expressions?

The values that give a value of 0 in the denominator for all expressions are the restrictions. To divide rational expressions, multiply the numerator by the reciprocal of the divisor. The restrictions to the domain of a product consist of the restrictions to the domain of each factor.

**What are restrictions and how do you find the restrictions on a rational expression?**

To find the restricted values of a rational expression:

- Set the denominator equal to zero.
- Solve the equation.
- The solution or solutions are the restricted values.

### What are restrictions in rational expressions?

Rational expressions usually are not defined for all real numbers. The real numbers that give a value of 0 in the denominator are not part of the domain. These values are called restrictions. Simplifying rational expressions is similar to simplifying fractions.

**Why are there restrictions on rational expressions?**

The restriction is that the denominator can not be equal to zero. So in this problem, since 4x is in the denominator it can not equal zero. Find all values of x that give you a zero in the denominator. To find the restrictions on a rational function, find the values of the variable that make the denominator equal 0.

#### Is there another method in dividing rational expressions?

The method of dividing rational expressions is same as the method of dividing fractions . That is, to divide a rational expression by another rational expression, multiply the first rational expression by the reciprocal of the second rational expression.

**What is the rule you need to do first when dividing rational expressions?**

To divide, first rewrite the division as multiplication by the reciprocal of the denominator. The steps are then the same as for multiplication. When expressing a product or quotient, it is important to state the excluded values.

## How do you simplify and find restrictions?

Tip: To find the restrictions, set each factor in the denominator equal to zero and solve. The factors in the numerator do not contribute to the list of restrictions. Simplify and state the restrictions to the domain.

**Can a rational expression have no restrictions?**

when the denominator is 0, so if the denominator does not have any zeroes, then there will be no restrictions. Also, remember that this is a rational function, so the denominator must be a polynomial.

### What is the first step in dividing rational expressions?

The steps involved in dividing two rational expressions are:

- Factor both the numerators and denominators of each fraction.
- Change from division to multiplication sign and flip the rational expressions after the operation sign.
- Simplify the fractions by canceling common terms in the numerators and denominators.

**When do you check for restrictions in a rational expression?**

Note: rational expressions must be checked for restrictions by determining where the denominator is equal to zero. These restrictions must be stated when the expression is simplified. Example 1:State the restrictions for the following rational expressions

#### Which is the domain of a rational expression?

A rational expression is a ratio of two polynomials. The domain of a rational expression includes all real numbers except those that make its denominator equal to zero. We can multiply rational expressions in much the same way that we multiply numerical fractions — by factoring, canceling common factors, and multiplying across.

**How to divide and multiply a list of restrictions?**

Divide. The list of restrictions in the previous problem is a bit more involved. As before, look at all the factors in the denominator, even if it was cancelled, to find the values that evaluate to zero. Look at the denominators in each step to identify the restrictions.

## Is the divisor of a rational expression equal to zero?

The divisor is defined for all -values, and is equal to zero for . Therefore, we can conclude that the resulting quotient is defined for . This is our final answer: 1) Divide and simplify the result. [I need help!] As always, we multiply the dividend by the reciprocal of the divisor.