# Domain/Range Problem

• Jul 29th 2008, 02:29 PM
JoeF107
Domain/Range Problem
Me and some of my classmates are stumped on this problem, which asks for the domain and range in interval notation. We are using web-work, an online program where you in-put your answers, and it immediately tells you whether tour answers are right or wrong. So, here's the problem:

17 √x−12

I entered "(0, infinity)" for the Domain and "(-12, infinity)" for the range... both were wrong :/ I got those figures by plugging the equation into my graphing calculator and looking at the graph/number table. That, and the fact that any negative x value would not return a real number.

Any suggestions?
• Jul 29th 2008, 03:31 PM
mr fantastic
Quote:

Originally Posted by JoeF107
Me and some of my classmates are stumped on this problem, which asks for the domain and range in interval notation. We are using web-work, an online program where you in-put your answers, and it immediately tells you whether tour answers are right or wrong. So, here's the problem:

17 √x−12

I entered "(0, infinity)" for the Domain and "(-12, infinity)" for the range... both were wrong :/ I got those figures by plugging the equation into my graphing calculator and looking at the graph/number table. That, and the fact that any negative x value would not return a real number.

Any suggestions?

I assume it's $\displaystyle f(x) = 17 \sqrt{x - 12}$ ......?

The (maximal) domain is the set of values of x for which the function is defined. The function is only defined for $\displaystyle x - 12 \geq 0$. Therefore ........ Plot a graph to see what the range will be.
• Jul 29th 2008, 04:24 PM
JoeF107
Thanks for the help, I got it work! :)