y2 + y − 7
y2 + 3y − 10 + y2 + 5y − 13
y2 + 3y − 10 

Let's simplify each of the given expressions:

1. **\( y^2 + y - 7 \):**

This expression is already simplified and can't be reduced further.

2. **\( y^2 + 3y - 10 + y^2 + 5y - 13 \):**

   Combine like terms:

   \[
   y^2 + y^2 + 3y + 5y - 10 - 13
   \]

   Simplifying this:

   \[
   2y^2 + 8y - 23
   \]

3. **\( y^2 + 3y - 10 \):**

This expression is also simplified and can't be reduced further.

### Summary:
- Expression 1: \( y^2 + y - 7 \)
- Expression 2: \( 2y^2 + 8y - 23 \)
- Expression 3: \( y^2 + 3y - 10 \)

Would you like further details or have any questions?

### Related Questions:
1. How can you factor the expression \( y^2 + y - 7 \)?
2. What is the process to factor \( 2y^2 + 8y - 23 \)?
3. How do you find the roots of the quadratic equation \( y^2 + 3y - 10 = 0 \)?
4. How can you solve the equation \( y^2 + 5y - 13 = 0 \) by completing the square?
5. What are the applications of quadratic equations in real-life scenarios?

### Tip:
When simplifying algebraic expressions, always start by combining like terms, which have the same variables raised to the same powers.

y2 + y − 7
y2 + 3y − 10 + y2 + 5y − 13
y2 + 3y − 10

This page provides a detailed step-by-step solution to simplifying algebraic expressions like y² + y − 7 and combining terms in y² + 3y − 10 + y² + 5y − 13. Explore key algebraic concepts and methods suitable for students in Grades 7-9.

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