The expression $(x - 3)(x + 9)$ can be expanded using the distributive property (also known as FOIL method for binomials):

$(x - 3)(x + 9) = x(x + 9) - 3(x + 9)$

Expanding each term:

$= x^2 + 9x - 3x - 27$

Now, combine like terms:

$x^2 + 6x - 27$

So, the expanded form of the expression is $x^2 + 6x - 27$.

Would you like more details or have any questions?

Here are 8 related questions:

1. How would you factor the expression $x^2 + 6x - 27$?
2. What is the vertex of the quadratic function $y = x^2 + 6x - 27$?
3. How do you solve the equation $(x - 3)(x + 9) = 0$?
4. Can the expression $x^2 + 6x - 27$ be factored using integers?
5. What is the axis of symmetry for the function $y = x^2 + 6x - 27$?
6. How would you complete the square for the expression $x^2 + 6x - 27$?
7. What are the roots of the equation $x^2 + 6x - 27 = 0$?
8. How does the sign of the constant term affect the graph of $y = x^2 + 6x - 27$?

Tip: When expanding binomials, the distributive property is a powerful tool to break down the multiplication into simpler steps.