Subtraction of polynom
1. (5x² + 3x - 6) - (3x² + x + 7)
2. (5x³ - 9x² + 7x - 4) - (2x³ + 7x² -5x + 8)
3. (10x² -11x +15) - (9x² + x -20)
4. (6x³ -10x² + 7x - 11) - (7x³ + 2x² -5x + 9)