Let's simplify the expression:

\[
x^2 + 5x - 3x - 15
\]

First, combine like terms (the terms with \( x \)):

\[
x^2 + (5x - 3x) - 15 = x^2 + 2x - 15
\]

So, the simplified expression is:

\[
x^2 + 2x - 15
\]

Would you like further details on how to factor this, or any other clarification?

Here are 5 related questions to consider:
1. How do you factor quadratic expressions like \(x^2 + 2x - 15\)?
2. How do you complete the square for expressions like \(x^2 + 2x - 15\)?
3. What are the methods for solving quadratic equations?
4. How does the quadratic formula help solve \(x^2 + 2x - 15 = 0\)?
5. Can you graph the expression \(x^2 + 2x - 15\)? What are its roots?

**Tip:** Always try to simplify an expression by combining like terms before solving or factoring.

Learn how to simplify and factor the quadratic expression x^2 + 2x - 15. This problem covers important algebraic concepts, including combining like terms and factoring methods. Suitable for students in Grades 7-9, it provides a clear step-by-step explanation of the process.

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