Final answer:
To expand the expression (x+3)(x+3), we can use the distributive property and then combine like terms to simplify the expression to x² + 6x + 9.
Step-by-step explanation:
To expand the expression (x+3)(x+3), you can use the distributive property. Multiply each term in the first parentheses by each term in the second parentheses:
- x * x = x²
- x * 3 = 3x
- 3 * x = 3x
- 3 * 3 = 9
Now combine the like terms:
- x² + 3x + 3x + 9
- x² + 6x + 9
Therefore, the expanded expression is x² + 6x + 9. Hence, the correct option is (A) x² + 6x + 9.