Answer:
Step-by-step explanation:
We have to add the like terms. Like terms are with variables of same power.
-8n³ and 7n³ are like terms , now add the coefficient of n³ , -8 + 7 = -1
-8n³ + 7n³ = -1n³
(-8n³ + 4n - 8) + (7n³ - 2n + 6 )
Combine like terms
= -8n³ + 7n³ + 4n - 2n - 8 + 6
= -1n³ + 2n - 2
