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Giải các phương trình sau :
1. 3x\(^2\)-2x-1=0
2. x\(^2\)-8x+15=0
3. 2x\(^2\)+6x+5=0
4. 5x\(^2\)+2x-3=0
5. x\(^2\)+13x+42=0
6. x\(^2\)-10+2=0
7. x\(^2\)-7x+10=0
8. 5x\(^2\)+2x-7=0
9. 4x\(^2\)-5x+7=0
10. x\(^2\)-4x+21=0
11. 5x\(^2\)+2x-3=0
12. 4x\(^2\)+28x+49=0
13. x\(^2\)-6x+48=0
14. 3x\(^2\)-4x+2=0
15. x\(^2\)-16x+84=0
16. x\(^2\)+2x-8=0
17. 5x\(^2\)+8x+4=0
18. x\(^2\)-2(\(\sqrt{3}\) +\(\sqrt{2}\) )x+4\(\sqrt{6}\)=0
19. x\(^2\)-6x+8=0
20. 3x\(^2\)-4x+2=0