anyone know how to do domain of a function?

Question

michaelbp · Answer

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leenathan · Answer

ik how to get a computer domain and code it that what you mean?

3mar · Answer

What you picked?

michaelbp · Answer

im way past that problem now ive gotten most right just by guessing

3mar · Answer

??

3mar · Answer

do you know what fog(x) mean?

michaelbp · Answer

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michaelbp · Answer

just needing the answer im about to leave this class and im almost done

3mar · Answer

Not recommended to give you a direct answer!

michaelbp · Answer

well then please help i really need a good grade

3mar · Answer

I wish you have A+, but try with me, don't let me solve alone!

michaelbp · Answer

ok

3mar · Answer

fog means replace every x in f(x) and put g(x) as it is.
$$(fog)(x)=6(\sqrt{x-6})-3$$

3mar · Answer

You decide whatever 3 belongs to the domain of this new function or not!

3mar · Answer

@michaelbp

michaelbp · Answer

i dont get it

3mar · Answer

Where are you stuck?

michaelbp · Answer

attachment

3mar · Answer

leenathan · Answer

i see a mod

michaelbp · Answer

so i plug in x^2-4x for all the x in f(x)

3mar · Answer

Great 
You got it!

michaelbp · Answer

so f(x)=1/x^2-4x

aravindg · Answer

Just watching :) Good work @3mar 

@michaelbp  Did you understand it clearly?

3mar · Answer

Correct!
But you'd better to use the parentheses to be accurate!
$$f(x)=\frac{ 1 }{ x^2-4x }$$

michaelbp · Answer

so wouldnt it be 3x^2

michaelbp · Answer

1/3x^2

3mar · Answer

Why??????????
this is raised to the power 2 and that to the power one!!!!!
How do you subtract terms are not in the same bases?

michaelbp · Answer

well i have to go class is over :/

mathmale · Answer

Mind explaining your reasoning when you give your version of "domain?"
What does "domain" mean to you, and what does it mean to "do domain?"

3mar · Answer

Question closed!
Who are you talking to!?