Simplify the expression and give your answer in the form of $\displaystyle {\frac{{{A}}}{{{B}}}}.$

$\displaystyle {\frac{{{\frac{{{4}}}{{{a}+{h}}}}-{\frac{{{4}}}{{{a}}}}}}{{{h}}}}$

Your answer for $\displaystyle {A}$ is : Preview Question 6 Part 1 of 2  
Your answer for $\displaystyle {B}$ is : Preview Question 6 Part 2 of 2