## Expanding (x + 11)² into a Trinomial

The expression (x + 11)² represents the square of a binomial. To expand it into a trinomial in standard form, we can use the following steps:

### Understanding the Concept

The expression (x + 11)² is equivalent to multiplying (x + 11) by itself:

**(x + 11)² = (x + 11)(x + 11)**

### Using the FOIL Method

To multiply the two binomials, we can use the **FOIL** method:

**F**irst: x * x = x²**O**uter: x * 11 = 11x**I**nner: 11 * x = 11x**L**ast: 11 * 11 = 121

Combining the terms, we get:

**x² + 11x + 11x + 121**

### Simplifying the Trinomial

Finally, we combine the like terms to get the trinomial in standard form:

**x² + 22x + 121**

### Conclusion

Therefore, the expansion of (x + 11)² as a trinomial in standard form is **x² + 22x + 121**.