Question 895308
to make it easier for you, let's multiply the first two terms, and then multiply their product with the third term.

{{{(3x+4)(x+3)= 3x^2 + 9x + 4x + 12}}} FOIL METHOD
{{{2x(3x^2 + 9x + 4x + 12) = 6x^3 + 18x^2 + 8x^2 + 24x}}}
{{{6x^3 + 26x^2 + 24x}}}