- 5x × (x - 3) + 5 × (x - 1)² = - 20
- 5x² + 15x + 5 × (x² - 2x + 1) = - 20
- 5x² + 15x + 5x² - 10x + 5 = - 20
5x + 5 = - 20
5x = - 20 - 5
5x = - 25
x = - 5
- 5x × (x - 3) + 5 × (x - 1)² = - 20
- 5x² + 15x + 5 × (x² - 2x + 1) = - 20
- 5x² + 15x + 5x² - 10x + 5 = - 20
5x + 5 = - 20
5x = - 20 - 5
5x = - 25
x = - 5