Factor Trinomial 67Ba4D

1. **Problem:** Factor $x^2+6x+9$. 2. Use the perfect-square trinomial formula $a^2+2ab+b^2=(a+b)^2$. 3. Here, $x^2$ is $x^2$, the middle term is $6x=2\cdot x\cdot3$, and $9=3^2$. 4. Therefore, $x^2+6x+9=x^2+2\cdot x\cdot3+3^2=(x+3)^2$. 5. **Final answer:** $(x+3)^2$.