book Maths Puzzle Numerical Ability

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

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book Other Question
given g(x)= -2x^2-8x+12.......what are the solutuions for g(x)=0, and g(x)<0. Solve each of the following systems by substitution.

5x - 2y = -5
Y - 5x = 3