exam Maths Puzzle Numerical Ability

How do I start this problem:
Given f(x)=4+3x-x^2 ,find and simplify f(h+5) - f(h-3)

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exam Other Question

find the product

(9x-8)^2
a. 81x^2+64
b. 9x^2+64
c. 9x^2-144x+64
d. 81x^2-144x+64 You invest $6000 in two accounts paying 9% and 6% anual interest. At the end of the year, the total interest from these investments was $480. How much was invested at each rate?