Answer:
[tex]54x^{3} +81x^{2} +66x+15[/tex]
Step-by-step explanation:
Distribute the parenthesis.
[tex]9x * 6x^{2} +9x*7x+9x*5+3*6x^{2} +3*7x+3*5[/tex]
Simplify this by using multiplication and addition.
= [tex]54x^{3} +81x^{2} +66x+15[/tex]
This is the final answer. Hope this helps, please mark brainliest if possible :)
