how do you do thiss ?

Answer:
3[tex]x^{4}[/tex]
Step-by-step explanation:
Using the rule of exponents
[tex]\frac{a^{m} }{a^{n} }[/tex] = [tex]a^{(m-n)}[/tex]
Given
[tex]\frac{18x^8}{6x^4}[/tex]
= [tex]\frac{18}{6}[/tex] × [tex]\frac{x^8}{x^4}[/tex]
= 3 × [tex]x^{(8-4)}[/tex]
= 3[tex]x^{4}[/tex]