book Maths Puzzle Numerical Ability

SIMPLY THIS EQUATION

(a + b)^2 - (a - b)^2 divided by 2ab

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book Other Question

I am having trouble with these problems:
1. If (x,y) is in quadrant 2, where is the point ((-1)^36x, (-1)^49y)?

2. Simplify the expression -5x^0 +7

3. What is the factor of
Find the vertex and focus of the Parabola whose equation is 4(y-2) = (x-4) ^2.

Thank you for your help!