Answer:
[tex]3x^{2}+26x+48[/tex]
Step-by-step explanation
Just in case you need to solve it, I'm using distributive property:
[tex]3x(x+6) + 8(x+6)[/tex]
[tex]3x^{2}+18x+8(x+6)[/tex]
[tex]3x^{2}+18x+8x+48[/tex]