book Maths Puzzle Numerical Ability

Will someone please help me with this:
Simplify:
(4x^5/2x^2)-4 this is what I tried:
=2x^3 neg 4th power

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book Other Question

Divide and simplify

3x^2 +13x + 4 / 3x^2-5x-12
____________ ________________
16-x^2 3x-12
Given f (x) = 4x + 4, find f (x + 2)
A) 3x + 2 B) 4x + 6 C) x + 6 D) 4x + 12