If you would like to solve (2 * p + 7) * (3 * p - 9), you can calculate this using the following steps:
(2 * p + 7) * (3 * p - 9) = 2 * p * 3 * p - 2 * p * 9 + 7 * 3 * p - 7 * 9 = 6 * p^2 - 18 * p + 21 * p - 63 = 6 * p^2 + 3 * p - 63
The correct result would be 6 * p^2 + 3 * p - 63.