If you would like to solve 16x^2 - 81 = 0, you can calculate this using the following steps:
16x^2 - 81 = 0
(4x - 9) * (4x + 9) = 0
1. 4x - 9 = 0 ... 4x = 9 ... x = 9/4
2. 4x + 9 = 0 ... 4x = - 9 ... x = - 9/4
The correct result would be: x = 9 over 4, x = −9 over 4.
