exam Maths Puzzle Numerical Ability

I need help with 3x^2 - 2x + 1 = 0

I came out with x = 2/6 + sqrt 8/6

Did I do this right?

I see the answer, but am confused on what the "i" means?

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exam Other Question
help please! Let f(x)=x+2
write the function f(x)= |x+2| as a composition of the functions f and g. ((x/(x-2))-(12/((x^2)-4))-(3/(x+2)))=0