Rewrite the first factor as a single fraction. Do this by rewriting $1$ as $\frac{y}{y}$.

$\left(\frac{y+x}{y}\right)\left(\frac{4y^2}{x^2-y^2}\right)$

Factor all expressions and simplify as in problem 2-114.

Since you are dividing, invert the second fraction and multiply.
Be sure to factor all of the expressions and then simplify.