book Maths Puzzle Numerical Ability

I know this is the answer for 2X^2-3X+1=0. But if it were to be left irrational root in simplest form would this be it?

3(+-)Sqrt 1 / 4

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How do i do this problem

(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2) PLease help!
The question needs to be explained step by step so I can explain and understand it for a project please?

Find the midpoint of the line segment PQ for P(2,-2), Q(3,4)

Thank you for your help.
Denise