Mathematics
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OpenStudy (phebe):
WHAT IS THE DOMAIN OF THE FUNCTION?
y=3sqrt 6x+42
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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
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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
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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
\[y=3\sqrt {6x}+42\]
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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?
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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
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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
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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
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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
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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):
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