what is the domain for f(x)=x(7-2x)^2

Question

hartnn · Answer

when there is denominator, all values of x when denominator =0 are excluded from domain
when there is radical $(\sqrt {stuff})$, domain will have stuff >=0

when the function is polynomial, the domain is all real numbers.

hartnn · Answer

so, now can you tell me whats the domain of your function ?

anonymous · Answer

i thought it was all real numbers, but when i plugged it in to my hw site it said it was wrong

hartnn · Answer

are tou sure the question looked like 
$\Large f(x)=x (7-2x)^2$

??
if yes, then the domain IS all real numbers, for sure.

anonymous · Answer

yeah that is the equation but it won't accept all real numbers as the correct answer.

hartnn · Answer

can you attach a screenshot ? 
maybe they want answer in another form...

anonymous · Answer

it asked for it in interval notation, it was originally  a word problem which i solved for and got the equation that i sent you, it said that part was correct online.

hartnn · Answer

interval notation, 
$\Large (-\infty,\infty)$

did u put this ?

anonymous · Answer

yes

hartnn · Answer

that domain in interval notation is surely correct for the function you mentioned. 
i think there's some error in your system....ask your teacher about it.

anonymous · Answer

i will, thank you for your help.

hartnn · Answer

you're welcome ^_^
and since you are new here, if you have any doubts browsing this site, you can ask me :)
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