Algebra
posted by Soly .
Could you please check my answers and help me with one?
Find the domain of the function.
f(x)=8x2
I got the domain being (negative infinity, postive infinity).
g(x)= 3x/x^2 49 (This one I don't understand how to find the domain)

yes on domain
I assume the second is g(x)=3x/(x^249)
can x be +7 ? 
I try to figure out it, and since x^27 is a perfect square (x+7)(x7), I thought x couldn't be +7?