The problem in the image asks to simplify the expression $(-3ab)^2$.

Let's go through the steps to simplify this expression:

1. Start by applying the power rule, which states that $(xy)^n = x^n y^n$ for any terms $x$, $y$, and exponent $n$. $(-3ab)^2 = (-3)^2 \cdot (a)^2 \cdot (b)^2$

2. Calculate each term separately: $(-3)^2 = 9, \quad a^2 = a^2, \quad b^2 = b^2$

3. Multiply everything together: $(-3ab)^2 = 9a^2b^2$

Thus, the simplified form of $(-3ab)^2$ is $9a^2b^2$.

Would you like any further details or have any questions?

Here are 5 related questions you might find useful:

1. How would you simplify $(-4xy)^3$?
2. What is the general rule for raising a product to a power?
3. Can you simplify $(2a^3b)^2$?
4. How does raising a negative number to an even power affect the result?
5. What is the difference between raising a term to an odd versus an even power?

Tip: When simplifying expressions, apply the exponent to each factor in the parentheses separately.