Answer:
3x^3 + 17x^2 + 21x - 9
Step-by-step explanation:
\((x^2 + 6x + 9)(3x - 1)\)
Multiply each term in first parenthesis with 3x-1
x^2 times 3x-1 becomes 3x^3 -x^2
6x times 3x-1 becomes 18x^2 -6x
9 times 3x-1 becomes 27x -9
Now we combine like terms
3x^3 -x^2 + 18x^2 -6x + 27x - 9
3x^3 +17x^2 +21x -9
