Check your Understanding:
Factor completely the given polynomials.
1. x4 – 25x² + 144
2. x4 – x³ - 7x² + x + 6
3. x4 + 2x³ - 9x² - 2x + 8
4. x4 – 5x² + 4
5. 2x³ + 3x² - 8x – 12
