1. 5x3 + 2x2 - 20x - 8 = 0; x - 2 ( ) ( ) ( ) 2. 2x3 - 9x2 + 7x + 6 = 0; x - 2 ( ) ( ) ( ) 3. 9x3 + 9x2 - 49x + 15 = 0; 3x - 1 ( ) ( ) ( ) 4. 4x3 + 4x2 - 23x - 30 = 0; 2x - 5 ( ) ( ) ( ) 5. 5x3 - 39x2 + 78x - 40 = 0; x - 5 ( ) ( ) ( ) 6. 15x3 - 4x2 - 53x + 30 = 0; 5x - 3 ( ) ( ) ( ) |