Functions and Relations 2 Page 3 We are going to work on some of the exercises today:
Page 3 For a question like this, they give you a domain. This is called a restricted, or limited, domain. These are the only numbers you are allowed to use to find the range. So lets get a table built using y=.
This means that the domain may have values that make the expression undefined! This expression is a fraction. Therefore, there may be values that make it undefined. We need to check: Since 6 makes the denominator undefined, then choice 3 would have a restricted domain. The rest of the choices have no restrictions. That means that you could sub any value in for x and it will map to a y value! Notation:OR: Page 3
This time, we can not have a negative under the radical, so we need to check for it! Page 3
Since they give us the domain, we can sub in the domain values for x and determine the range values (y). Page 3
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Think: is there any number, when squared, that isn’t greater than or equal to -1? Therefore the domain is the set of all real numbers! Page 4 Since we have a fraction, we have to find the values of x that make the denominator undefined. Since the denominator is a radical, the values of x must also be greater than or equal to 0.
To do this, we can use the graphing calculator! Page 4