The video tutorial explains rational functions, which are defined as the ratio of two polynomial functions, similar to how rational numbers are defined as the ratio of two integers. It emphasizes that the denominator polynomial must not be zero. Examples of rational functions are provided, and the challenges of graphing these functions are discussed. The tutorial concludes by summarizing the properties and definitions of rational functions.

What is a rational function?

• A function that is the sum of two polynomials

• A function that is always positive

• A function that is the ratio of two polynomials

• A function that is always negative

Which of the following must be true for a rational function?

• The numerator must not be zero

• The denominator must be zero

• The numerator must be zero

• The denominator must not be zero

How is a rational function similar to a rational number?

• Both are always integers

• Both are defined as a ratio

• Both are always positive

• Both are always negative

Which of the following is an example of a rational function?

• x + 2

• x^2 + 3

• x^2 + 3 / x^3 + 5

• x^3 + 5

What is the numerator in the rational function x^2 + 3 / x^3 + 5?

• x^3 + 5

• x^2 + 5

• x^2 + 3

• x + 5

Why can't we predict the graph of a rational function easily?

• Because it is always constant

• Because it depends on the behavior of both polynomials

• Because it is always quadratic

• Because it is always linear

What must be understood before predicting the graph of a rational function?

• The sum of the polynomials

• The behavior of the graph

• The degree of the denominator

• The degree of the numerator

What is the range of a rational function?

• Real number to real number

• Negative number to negative number

• Integer to integer

• Positive number to positive number

What is the domain of a rational function?

• All real numbers except where the denominator is zero

• All integers

• All positive numbers

• All negative numbers

What is the key takeaway about rational functions?

• They are defined as a ratio of polynomials

• They are always constant

• They are always quadratic

• They are always linear