6.4 Exercise 36

Choose the appropriate pattern and use it to find the product:

ⓐ $\left(9 b - 2\right) \left(2 b + 9\right)$ ⓑ $\left(9 p - 4\right)^{2}$ ⓒ $\left(7 y + 1\right)^{2}$ ⓓ $\left(4 r - 3\right) \left(4 r + 3\right)$