Introduction to Functions - Algebra 2

is a rational function in simplest form whose denominator has a polynomial with degree greater than that of the polynomial in its numerator (2 and 1, respectively). The graph of such a function has as its horizontal asymptote the line of the equation .

All inputs are valid. There is nothing you can put in for x that won't work.

You cannot take the square root of a negative number.

The function includes all possible y-values (outputs). There is nothing you can put in for y that won't work.

Squaring an input cannot produce a negative output.

The function includes all possible y-values (outputs). There is nothing you can put in for y that won't work.

A number taken to a power must be positive.

The square root of any number cannot be negative.

The absolute value of a number cannot be negative.

To create the inverse, switch x and y making the solution x=3y+3.

y must be isolated to finish the problem.

The domain is all the possible values of . To determine the domain, we need to determine what values don't work for this equation. The only value that is not allowed for this equation is 5, since that would make the denominator have a value of , and you can not divide by . Therefore, the domain of this equation is:

and

The domain of any quadratic function is always all real numbers.

The range of this function is anything greater than or equal to 5.

These written in the correct notation is:

Soft brackets are needed for infinity and a hard square bracket for 5 because it is included in the solution.

Because the domain is giving us a wide range of values, we can easily eliminate the fractional function as it only isolates a single value. We can eliminate as it means I am restricted to as my domain but I am looking for domain values greater than . This leaves us with the radical functions.

We have to remember the smallest possible value inside the radical is zero. Anything less means we will be dealing with imaginary numbers.

, This means the domain is which doesn't match our domain so this is wrong.

, . This means the domain is which doesn't match our domain since we want to EXCLUDE so this is wrong.

Since this is fractional expression with a radical in the denominator, we need to remember the bottom can't be zero and just set that denominator to equal . Square both sides to get . This actually means is not acceptable but any values greater than that is good. This is the correct answer.

All inputs are valid. There is nothing you can put in for x that won't work.

All inputs are valid. There is nothing you can put in for x that won't work.

To find the domain, find all areas of the number line where the fraction is defined.

because the denominator of a fraction must be nonzero.

Factor by finding two numbers that sum to -2 and multiply to 1. These numbers are -1 and -1.

The domain is the set of x-values that make the function defined.

This function is defined everywhere except at , since division by zero is undefined.

The domain includes the values that go into a function (the x-values) and the range are the values that come out (the or y-values). A sine curve represent a wave the repeats at a regular frequency. Based upon this graph, the maximum is equal to 1, while the minimum is equal to –1. The x-values span all real numbers, as there is no limit to the input fo a sine function. The domain of the function is all real numbers and the range is .

All inputs are valid. There is nothing you can put in for x that won't work.