To evaluate the expression $3 \times 5^x$ when $x = 2$, substitute $x = 2$ into the expression:

$3 \times 5^2$

First, calculate $5^2$:

$5^2 = 25$

Now, multiply by 3:

$3 \times 25 = 75$

So, the value of the expression when $x = 2$ is $\boxed{75}$.

Would you like more details or have any other questions? Here are some related questions:

1. What is the general form of the expression $3 \times 5^x$?
2. How does the expression change when $x = 3$?
3. What would the result be for $x = 0$?
4. Can you explain the properties of exponents used here?
5. How would you solve similar problems involving different bases?

Tip: Remember that when evaluating expressions with exponents, start by solving the exponent part first!