| x+2 | x−2 | 16 | |||
− | − | = | |||
| x−2 | x+2 | x2−4 |
| x2 + 4x + 4 | x2 − 4x + 4 | 16 | |||
− | − | = | |||
| x2 − 4 | x2 − 4 | x2 − 4 |
| 8 | ||
− | ||
| x2 − 4 |
| x+2 | x−2 | 16 | |||
− | − | = | |||
| x−2 | x+2 | x2−4 |
| x2 + 4x + 4 | x2 − 4x + 4 | 16 | |||
− | − | = | |||
| x2 − 4 | x2 − 4 | x2 − 4 |
| x2 + 4x + 4 − x2 + 4x − 4 − 16 | |
= | |
| x2 − 4 |
| 8x −16 | |
= | |
| x2 − 4 |
| 8(x−2) | |
= | |
| (x−2)(x+2) |
| 8 | |
. | |
| x+2 |