Question

Find the domain of the function
\[g(x)=\frac{ 3x }{ x^2-81 }\]

fractions throw me all over the world every time that I see them I swear

Answer 1

You cant have a zero denominator so try making \[x^{2}+81 \neq 0\]

Answer 2

domain will be everything but that

Answer 3

erh... got a typo

Answer 4

correction,
\[x^{2}-81 \neq 0\]

Answer 5

\[(\infty,-9)\] ?

Answer 6

noo....
\[x^{2}-81 \neq 0 <=> x^{2}=81 => x=9 or x=-9\]
Domain ]-inf, -9[ U ]9,+inf[

Answer 7

DANG IT! >-< thank youuu lol

Answer 8

erh...it was wrong, sorry, its R except -9 and 9

Answer 9

R\{-9,9}

Answer 10

I see, it's okay c: thank you