Answer:
Option B (n³ + 4n² + 8n - 16)
Step-by-step explanation:
In this question we have to add two expressions given
( 2n³ + 4n² - 7 ) and ( -n³ + 8n - 9 )
( 2n³ + 4n² - 7 ) + ( -n³ + 8n - 9 )
Now we group the similar terms
( 2n³ - n³ ) + 4n² - ( 7 + 9 ) 8n
= n³ + 4n² - 16 + 8n
= n³ + 4n² + 8n - 16
Option B (n³ + 4n² + 8n - 16) is the correct answer.
