Hello!
We have the following expression:
[tex]2a\cdot a\cdot3a+b\cdot4b[/tex]Let's multiply and simplify it, look:
[tex]6a^3+4b^2[/tex]We multiply a*a*a, so we can rewrite it as a³. The same with b*b as b².
So, the answer in the simplified form is:
6a³ + 4b²
