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The problem asks for the first term in the expansion of \((x + 3)^2\).

To solve this, we can expand \((x + 3)^2\) using the binomial expansion formula:

\[
(a + b)^2 = a^2 + 2ab + b^2
\]

Here, \(a = x\) and \(b = 3\), so we apply the formula:

\[
(x + 3)^2 = x^2 + 2(x)(3) + 3^2
\]
\[
= x^2 + 6x + 9
\]

The first term in this expansion is \(x^2\), so the correct answer is **d. \(x^2\)**.

Would you like further details or have any other questions?

### Related questions:
1. How do you expand other binomials like \((x - 2)^2\)?
2. What is the general binomial expansion for \((a + b)^n\)?
3. How can you use Pascal's triangle in binomial expansions?
4. How would the expansion change if it were \((x + 3)^3\)?
5. Can you expand and simplify \((x + y)^2\)?

#### Tip: 
When expanding binomials, remember that the first term will always be the square of the first part of the binomial.

El primer término del desarrollo de (x + 3)^2 es:

Learn how to expand the binomial (x + 3)^2 and identify its first term. This problem demonstrates key algebraic concepts such as polynomial expansion and the binomial theorem. Ideal for students in Grades 8-10.

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