book Maths Puzzle Numerical Ability

given g(x)= -2x^2-8x+12.......what are the solutuions for g(x)=0, and g(x)<0.

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book Other Question

I need help with Algebra question concerning "domain" examples
find the domain of the function;

y=1/2x
y=1/x+3

Thanks, Tony
Can you help me with this problem. I have tried to answer this one but I can not get pass the first step. I am not sure if I am evening doing the problem right. (2/3) (12x2 – 18