Solve: 16x2 - 81 = 0.

x = 4, 9

x = - 4, - 9

x = 9 over 4, x = - 9 over 4

x = 81 over 16, x = - 81 over 16

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.