Question 387728
(-4 – 2x^5 + 9x^7 – 8x^6) – (x^6 + 4x^5 + 4 + 3x^7) 
.
9x^7-8x^6-2x^5-4
3x^7+1x^6+4x^5+4
-----------------subtract
6x^7-9x^6-6x^5-8