1. 10x² - 15x=0
2. X² - 4 =0
3. 9 - x² =0
4. X² - 1 = 0
5. ( x - 3 ) ( 2x - 1 ) = ( 2x - 1 ) ( 2x + 3 )
6. ( 5 + 4x ) ( -x + 2 ) = ( 5 + 4x ) ( 7+ 5x )
7. ( 4+x) (x-5) = (3x -8) (x-5) =0
8. ( 3x-8) (7-21x) = (9+2x) ( 7-21x)
9 ( 10 +7x) (x-1) = (9x-2) (x-1)
10. (9x-4) (x- 1/2 ) - ( x-1/2) (6+x) =0
11. 9x² -1 = (3x-1) (x + 4 )
12. (X+7) (3x +1) = 49 - x²
13. ( 2x +1)² = ( x-1)²
14. X³ - 5x² +6x =0
15. 3x² + 5x + 2 = 0
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