– 7x2 + 5x – 6 + 8x – 9 + 4x2 – 7x + 14 – x2 =
x2 – 3xy + y2 – 2y2 + 3xy – x2 + x2 + 3xy – y2 =
– x2 + x – 6 + x3 – 7x2 + 5 – x3 + 8x – 5 =
x2 – 4x – 7x + 6 + 3x2 – 5 =
a2 – 3ab + b2 – 5ab + a2 – b2 + 8ab – b2 – 2a2 =
a3 + a + a2 + 5 + 7a2 + 4a – 8a2 – 6 =
- b2
-8x2 + 9x - 6
4x2 - 11x + 1
a3 + 5a - 1
-4x2 + 6x - 1
x2 + 3xy - 2y2
