Answer:
3[tex]n^{4}[/tex] - 3n²
Step-by-step explanation:
(5[tex]n^{4}[/tex] - 2n²) - (4n² + 4[tex]n^{4}[/tex]) + (3n² + 2[tex]n^{4}[/tex])
Remove parenthesis, distributing the second one by - 1
= 5[tex]n^{4}[/tex] - 2n² - 4n² - 4[tex]n^{4}[/tex] + 3n² + 2[tex]n^{4}[/tex] ← collect like terms
= (5 - 4 + 2)[tex]n^{4}[/tex] + (- 2 - 4 + 3)n²
= 3[tex]n^{4}[/tex] + (- 3)n²
= 3[tex]n^{4}[/tex] - 3n²
