Hi.

Two questions.

1: f(m) = -2 / (-3+9m)

i got a domain (-infinity, 0.33) U (0.33, infinity) and range (-infinity, 0) U (0, inifinity). correct?

2: f(w) = 7 / ( -2 + |w| )

i have no idea about number two. help please~!

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- Mar 27th 2012, 11:12 PMtankertertDomain and range
Hi.

Two questions.

1: f(m) = -2 / (-3+9m)

i got a domain (-infinity, 0.33) U (0.33, infinity) and range (-infinity, 0) U (0, inifinity). correct?

2: f(w) = 7 / ( -2 + |w| )

i have no idea about number two. help please~! - Mar 27th 2012, 11:51 PMbiffboyRe: Domain and range
Domain can't include 2 or-2

- Mar 28th 2012, 12:04 AMtankertertRe: Domain and range
How did you get that?

- Mar 28th 2012, 12:09 AMprincepsRe: Domain and range
- Mar 28th 2012, 10:14 PMtankertertRe: Domain and range
Really need help guys.

how do i find range for first question and second? - Mar 30th 2012, 05:25 PMHallsofIvyRe: Domain and range
Well, it would be far better to write "domain (-infinity, 1/3) U (1/3, infinity)". Do you see why?

Quote:

and range (-infinity, 0) U (0, inifinity). correct?

If we write them so and . Now what value can y**not**be?

Quote:

2: f(w) = 7 / ( -2 + |w| )

**cannot**have -2+ |w|= 0 so we cannot have |w|= 2. What values of w are forbidden?

(This is the one biffboy was referring to.)

As for the range, again, let y= 7/(-2+ |w|) so that |w|- 2= 7/y so |w|= 2+ 7/y. What can y**not**be?

i have no idea about number two. help please~![/QUOTE]