Ask your own question, for FREE!
Mathematics 16 Online
OpenStudy (phebe):

WHAT IS THE DOMAIN OF THE FUNCTION? y=3sqrt 6x+42

OpenStudy (anonymous):

for which values of x the function doesn't exist?

OpenStudy (phebe):

6X

OpenStudy (phebe):

i think

OpenStudy (phebe):

idk but thats what the q says

OpenStudy (anonymous):

the 6x can't be negative because the square root from negative number doesn't exist

OpenStudy (anonymous):

so 6x=0 or 6x>0 x=0 or x>0

OpenStudy (phebe):

okay well can u help me with another one

OpenStudy (anonymous):

yes

OpenStudy (phebe):

thanks!!

OpenStudy (phebe):

What are the domain an range of the functions y=2 sqrt 3x+4-5

OpenStudy (dan815):

include the brackets

OpenStudy (anonymous):

is 3x+4 under the radical symbol>

OpenStudy (phebe):

yes

OpenStudy (phebe):

y=2 sqrt [3x+4-5]

OpenStudy (dan815):

\[y=3\sqrt {6x+42}\] like this or \[y=3\sqrt {6x}+42\]

OpenStudy (phebe):

first one

OpenStudy (dan815):

you cannot take the square root of a negative number(unless its complex)

OpenStudy (dan815):

therefore 6x+42>0 x>-42/6 x>-7

OpenStudy (dan815):

0 is fine too so x>=-7

OpenStudy (phebe):

wait which answer is that for?

OpenStudy (dan815):

you tell me

OpenStudy (phebe):

lol is it for the second one yall confusing me

OpenStudy (dan815):

domain means all the possible value of x, where the function wont break apart

OpenStudy (phebe):

@dan815 i need help with the other one i put up

OpenStudy (phebe):

What are the domain an range of the functions y=2 sqrt 3x+4-5

OpenStudy (dan815):

but you still didnt get question 1

OpenStudy (phebe):

i did

OpenStudy (phebe):

i been did i had moved on

OpenStudy (dan815):

... whats the answer?

OpenStudy (phebe):

it was -7

OpenStudy (phebe):

i just need number 2

OpenStudy (phebe):

What are the domain an range of the functions y=2 sqrt 3x+4-5

OpenStudy (dan815):

Okay, so do the same thing you did in question 1 on number 2 now

OpenStudy (phebe):

i did but i came up with some thing thats not on my answer choices

OpenStudy (dan815):

\[y=2 \sqrt {3x+4}-5\] I think it should be like this

OpenStudy (phebe):

yeass

OpenStudy (phebe):

thats what it looks like

OpenStudy (dan815):

okay so the stuff under the square root has be more than - again

OpenStudy (dan815):

so what is x?

OpenStudy (phebe):

3

OpenStudy (dan815):

has be more than 0

OpenStudy (phebe):

yes

OpenStudy (dan815):

when x is 3 what is under the square root?

OpenStudy (phebe):

um.....................idk

OpenStudy (dan815):

|dw:1429045830389:dw|

Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!
Can't find your answer? Make a FREE account and ask your own questions, OR help others and earn volunteer hours!

Join our real-time social learning platform and learn together with your friends!