book Maths Puzzle Numerical Ability

What is the turning point, and focus of y= 1/4x2? Also what is its directrix?

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book Other Question

How is (2a+4)(a-3)-(2a+4)(2a-1)completely factored to get -2(a+2)(a+2)as the answer? find the mistake in the problem and fix it.
if y = 30 and h = 2

6(30) 6+2-5
6y h+6-5
6(15)+6-5
90+6-5
96-5
91