6.4 Exercise 85

Find each product.

ⓐ $\left(x^{5} + y^{5}\right) \left(x^{5} - y^{5}\right)$ ⓑ $\left(m^{3} - 8 n\right)^{2}$ ⓒ $\left(9 p + 8 q\right)^{2}$ ⓓ $\left(r^{2} - s^{3}\right) \left(r^{3} + s^{2}\right)$