# What are the factors of xy + 3y − 7x − 21?

Algebra is the beach of mathematics that deals with variables and expressions, or simply values that are unknown. They have their applications in calculus as well.

## Answer: The factors of xy + 3y − 7x − 21 are (x + 3) and (y - 7).

Let's understand the solution in detail.

**Explanation:**

Given expression: xy + 3y − 7x − 21

Now, we take the common factors out in the following manner:

⇒ (xy + 3y) − (7x − 21)

⇒ y (x + 3) − 7 (x + 3)

⇒ (y - 7) (x + 3)