Respuesta :

asdfd
2n³  + 4n² - 7
+
-n³ + 8n - 9
______________
n³ + 4n² + 8n - 16

just add / subtract like terms; carry the others along like 4n² and 8n since they don't have like terms

Answer:

[tex]n^3+4n^2+8n-16[/tex]

Step-by-step explanation:

[tex]2n^3 + 4n^2 - 7 and -n^3 + 8n - 9[/tex]

find the sum of the polynomials

[tex]2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)[/tex]

Remove the parenthesis and combine like terms

[tex]2n^3 + 4n^2 - 7 -n^3 + 8n - 9[/tex]

[tex]2n^3 -n^3=n^3[/tex]

[tex]-7-9=-16[/tex]

[tex]4n^2, 8n[/tex] have no like terms

[tex]2n^3 + 4n^2 - 7 +(-n^3 + 8n - 9)=n^3+4n^2+8n-16[/tex]