exam Maths Puzzle Numerical Ability

Hi. Can I have some help finding the domain of this function?

g(x)=√x/2x^2+x-1

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exam Other Question

Please help, I am not sure if what I got for this solution correct. I got a=3 b=0 c=5. It asks to: express irrational solutions in simplest form. If it has no solution, write no solution.
3n^2-75=0
Please help me, Thank You=) can you please help me find the domain, range, intercepts and asymptotes for the function, f(x)=(3/(x+2))