exam Maths Puzzle Numerical Ability

State the minimum or maximum value for the quadratic function and name the x value at which this occurs: f(x)-2^2-6+5

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Ok this one I have no idea
z-8/z+5=4/7

Now do I need to use a LCd? Which I believe would be 35.
Know I think I am supposed to mult. 35 by both sides.
(35)z-8/z+5 and (35)4/7
Now is this ok so far?? Graph this equation y=3/4x+2. McGraw Hill 6th edition, chapter 6,section 3, problem # 20. Thanks so much for your help!!!!!!!!!!!!!!!!!!!