# domain and range

• Sep 25th 2008, 07:24 PM
MizzLeggs
domain and range
were investigating a function y = 1 over x - 6 . How do i find the RAnge and the Domain?? (Headbang) i forgett...
• Sep 25th 2008, 07:28 PM
Jhevon
Quote:

Originally Posted by MizzLeggs
were investigating a function y = 1 over x - 6 . How do i find the RAnge and the Domain?? (Headbang) i forgett...

the domain is the set of x-values for which the function is defined. the range is the set of y-values we can hit when plugging in any of these x-values. start by finding what x's cannot work, then say the domain is all x's but those. as for the range, knowing what the graph looks like (which you should) should help you

does that help?
• Sep 25th 2008, 10:48 PM
Prove It
Quote:

Originally Posted by MizzLeggs
were investigating a function y = 1 over x - 6 . How do i find the RAnge and the Domain?? (Headbang) i forgett...

Is that

$\frac{1}{x-6}$

or

$\frac{1}{x} - 6$?
• Sep 30th 2008, 03:23 AM
kus_ks
Plz help me in finding the domain ?
Plz help me in finding the domain ? If f(x) is defined over [0,1] , then what is the domain for the function f(2x+3)
• Sep 30th 2008, 03:54 AM
mr fantastic
Quote:

Originally Posted by kus_ks
Plz help me in finding the domain ? If f(x) is defined over [0,1] , then what is the domain for the function f(2x+3)

2x + 3 = 0 => x = -3/2.
2x + 3 = 1 => x = -1.

So the domain of f(2x+3) is [-3/2, -1].

By the way, questions unrelated to the original question should be posted in a new thread.