The expression $(x - 3)^2$ represents a binomial squared. To expand this, you can apply the formula for the square of a binomial:

$(a - b)^2 = a^2 - 2ab + b^2$

In this case, $a = x$ and $b = 3$, so:

$(x - 3)^2 = x^2 - 2(3)(x) + 3^2$

Simplifying:

$(x - 3)^2 = x^2 - 6x + 9$

So, $(x - 3)^2 = x^2 - 6x + 9$.

Would you like more details or have any questions?

Here are 5 related questions for further exploration:

1. What is the expansion of $(x + 4)^2$?
2. How would you expand $(2x - 5)^2$?
3. How can you factor $x^2 - 10x + 25$?
4. What is the general form for $(ax + b)^2$?
5. How do you complete the square for the expression $x^2 - 6x$?

Tip: When expanding binomials, always apply the square of a binomial formula and simplify step by step.