The document contains instructions to reduce and simplify several polynomial expressions by combining like terms. It also contains instructions to subtract polynomials and find the difference of polynomial expressions.

1. Reduce:
x – 4x + (8 – x) – 8 – (x – 2)
2x – 6y + 2x – y – (3x – y)
10 + x – y + x – 5 – (y – 7)
2x – 5y + –9 – (–2x – 2y)
+(4x – y)

2. Se tienen:
F = 3(2x2 + xy2 – 2y2)
G = –(6y2 – 4x2y + x2)
H = –(–4x2y2 + 2x2y – 9xy2)
Halla:
(F – G) +H
5(F – G) + 2G

3. Encuentra la resta de los siguientes
polinomios:
P = 5x3 – 3x + 5 – 4x2
Q = 9x2 + 4 + 4x3 – 2x
R = 3x2 – 8x + 8 – 12x3
Calcula:
P – Q – R