Tìm x biết: 1. \( x(x + 3) - (x - 1)^2 = 5 \), 2. \( 2x(3x + 5) - x(6x - 1) = 33 \), 3. \( (x - 2)^3 - x(x + 1)(x - 1) + 6x^2 = 5 \)

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Bài 2: Tìm x biết:

1. \( x(x + 3) - (x - 1)^2 = 5 \)

2. \( 2x(3x + 5) - x(6x - 1) = 33 \)

3. \( (x - 2)^3 - x(x + 1)(x - 1) + 6x^2 = 5 \)

4. \( x^2 - 9 = 2(x + 3)^2 \)

5. \( (2x - 1)^2 = 49 \)

6. \( 4x^3 - 100x = 0 \)

7. \( (x + 1)(x + 3) - x(x + 2) = 7 \)

8. \( 2(x + 4) - x^2 - 4x = 0 \)

9. \( (x + 3)^2 = (1 - 2x)^2 \)

10. \( x^3 + 27 + (x + 3)(x - 9) = 0 \)

11. \( x^3 + 2x^2 + x + 2 = 0 \)

12. \( x^3 - 7x^2 + 12x = 0 \)

13. \( x^3 - 4x^2 + 8x - 32 = 0 \)

14. \( x^3 - 3x^2 + 6x - 8 = 0 \)

15. \( (2x^3) - 4x(x + 4) = 15 \)

16. \( x^2 - 6x + 9 - (3 - x)(x + 2) = 0 \)

17. \( x^3 + 27 + (x + 3)(5 - 9x^2) = 0 \)

18. \( x^2 - 4x + 4 = 2(x - 2)(x + 3) \)

19. \( x^3 + 27 - (x + 3)(x - 9) = 0 \)

20. \( (x + 3)(x - 4)(-2x + 1)(x - 3) = -x(x + 2) \)