book Maths Puzzle Numerical Ability

How do i do this problem

(1/2y^2 z+ 3/4yz-1/8z^2)+(3/4y^2 z+3/4yz+z^2)

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book Other Question

can you help me solve and graph (((2/x-4 > or = 2))) 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