Answer:
5[tex]g^{4}[/tex] - h² + 8f² + 5
Step-by-step explanation:
3h² - 4[tex]g^{4}[/tex] + 7 + 7f² + 9[tex]g^{4}[/tex] - 4h² + f² - 2 ← collect like terms
= (- 4 + 9)[tex]g^{4}[/tex] + (3 - 4)h² + (7 + 1)f² + (7 - 2)
= 5[tex]g^{4}[/tex] - h² + 8f² + 5
