Need help now please!!!!
domain and range help!
y=sqrt3x
and
y=sqrt(5x-3)

- anonymous

Need help now please!!!!
domain and range help!
y=sqrt3x
and
y=sqrt(5x-3)

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- anonymous

@mathway

- anonymous

anyone?

- Ac3

you need the domain and range?

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## More answers

- anonymous

yes for both of them

- Ac3

Do you know how to graph them?

- anonymous

yes i was getting like 0, infinity and stuff like that but wasn't sure if it was right

- Ac3

ok what did you get for sqrt(3x)?

- anonymous

let me check real quick

- anonymous

ok i had x>=0 for domain and y<=0 for range

- Ac3

|dw:1439165090472:dw|

- anonymous

the second one went a little like domain 3/5 and range 0

- Ac3

range of 0 is not possible

- anonymous

okay. i knew i didn't know what i was doing..

- Ac3

Domain is how far left and right (on x-axis) the graph goes.

- Ac3

Range is how far up and down(on y-axis) the graph goes

- anonymous

okay. makes sense.

- anonymous

now how would i figure it out?

- anonymous

i would rather have help then get it wrong again..

- Ac3

By using the graph.

- Ac3

Look at the graph how far to the left does it go?

- Ac3

What x value?

- anonymous

0

- Ac3

ok now how far to the right?

- anonymous

its infinity..

- anonymous

it doesn't have a endpoint.

- Ac3

exactly so for domain the common way of writing it is (left farthest x-value,right farthest x-value)

- anonymous

so it'll be 0, infinity?

- Ac3

so here it's [0,infiniti)

- anonymous

okay now the range.

- Ac3

keep in mind the graph does touch 0 so you have to use a bracket. You use the parenthesis when you don't touch the value. Since we never touch infinity we use a parenthesis.

- Ac3

Ok now range

- Ac3

What's the lowest point?

- anonymous

okay. thanks for letting me know that because i wasn't even using those.

- anonymous

0

- Ac3

Ok and we do touch 0 correct?

- anonymous

yes.

- Ac3

ok so the first part of the range is [0,

- Ac3

now what's the highest point?

- anonymous

and it'll be infinity again right?

- Ac3

Exactly, and because we don't touch it we use parenthesis.

- Ac3

so the range is [0,infinity)

- anonymous

awesome

- Ac3

same as domain.

- Ac3

Ok now on to the next one.

- anonymous

[0.6,infinity) ?

- anonymous

then the range is [0, infinity) ?

- Ac3

Yes

- Ac3

Keep in mind most professors don't like decimals. So rewrite domain as [3/5,infinity)

- anonymous

awesome.. thank you! do you think you could stick around and see if you could help me with this other thing I'm stuck on?

- anonymous

its finding the inverse of these functions and I've been stuck on it for hours

- Ac3

Alright if it's quick I will make a new question though and close this one.

- Ac3

Oh that's easy.

- anonymous

so you want me to close this one?

- Ac3

Yes you should.

- anonymous

ok one second.

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