| 14x² – 21x = | | |
| 2x² – 12x + 18 = | | |
| 5x² + 50x + 45 = | | |
| 4ax² + 4ax – 24a = | | |
| x⁴ – 5x² + 4 = | | |
| 15mx²y² – 25mx² – 20m⁴xy = | | |
| 9x²y³– 18xy² + 3x³y² = | | |
| 16x⁴ – 81y⁴ = | | |
| 242x² + 308xy + 98y² = | | |
| 625x⁴ – y⁴ = | | |
| 3x²m + 12mx – 15m = | | |
| x⁴ – 17x² + 16 = | | |
| 2x² + 16x + 32 = | | |
| 5x² – 50x + 80 = | | |
| 4x² + 16x + 8 = | | |
| 3x² – 27y² = | | |
| 18x²y – 32xy³ = | | |
| 4x² – 28x + 24 = | | |
| 2x⁴ + 16x² + 32 = | | |
| 3x² + 27y² = | | |