Simplify:
5x4 – 15x2 + 10x – 2x3 + 6x – 4 – (6x3 + 8x2 – 10x – 3x2 – 4x + 5)
= 5x4 – 15x2 – 2x3 + 16x – 4 – 6x3 – 5x2 + 14x – 5
= 5x4 – 8x3 – 20x2 + 30x - 9
31
Simplify:
5x4 – 15x2 + 10x – 2x3 + 6x – 4 – (6x3 + 8x2 – 10x – 3x2 – 4x + 5)
= 5x4 – 15x2 – 2x3 + 16x – 4 – 6x3 – 5x2 + 14x – 5
= 5x4 – 8x3 – 20x2 + 30x - 9