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
Find the slope of any line parallel to the line through points (19, 7) and (4, 8). a) 4*12-2/3
b) 3+10/3-1*2
c) (3+4)*3-6/9
d) 7x-11y=1
e) 4x+5y=12