book Maths Puzzle Numerical Ability

Find (a)the directix,(b)the focus and (c)the roots of the parabola y=x^2-5x+4

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book Other Question

Please help i have no clue how to do either of these problems.
Given f(x)=x^2+3x-2, find f(2)
and Given h(x)=4x+8, find 4[h(-3/4)].
Thanks for the help, and please explain how to do these problems. (b+22) +3= b+ (22+3)