## Solving (x + 3)(x + 3) using the Identity

This problem involves expanding the expression (x + 3)(x + 3) using an algebraic identity.

### Understanding the Identity

We can utilize the **square of a binomial** identity:

**(a + b)² = a² + 2ab + b²**

In our case, 'a' is 'x' and 'b' is '3'.

### Applying the Identity

Let's substitute the values into the identity:

(x + 3)² = x² + 2(x)(3) + 3²

### Simplifying the Expression

Now, simplify the expression by performing the multiplication and squaring:

(x + 3)² = x² + 6x + 9

### Final Result

Therefore, the expanded form of (x + 3)(x + 3) using the identity is **x² + 6x + 9**.