1. x² + 15 = 8x
2. x² = x + 6
3. x² + 6x = - 8
4. 4x² - 20x + 25 = 0
5. x² - 2x - 15 = 0
6. 6x² + 13x - 5 = 0
7. 5y² - 2y - 3 = 0
8. x² - 6x + 2 = 0
9. x² + 2x - 5 = 0
10. x²- 4x + 5 = 0
11. 4x² = -4x - 17
12. 36y² - 24y = -85
13. z²-5z = 0
14. 1 x² + 5 z = 0
3 6
15. x² - 25 = 0
16. x² - 1 = 0
4
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