To evaluate the simplified expression \( 3x \) with \( x = 5 \), substitute 5 for \( x \):

\[
3x = 3 \times 5
\]

\[
3 \times 5 = 15
\]

Therefore, when \( x = 5 \), the value of the expression is:

\[
\boxed{15}
\]

Would you like more details or have any questions?

Here are 5 related questions for further practice:

1. What is the value of \( 4x + 2 \) when \( x = 5 \)?
2. If \( x = -2 \), what is the value of the expression \( 3x \)?
3. Evaluate \( 2x^2 + 3x - 5 \) when \( x = 5 \).
4. Substitute \( x = 3 \) into the expression \( 4x - 7 \) and find its value.
5. If \( 5x - 10 = 15 \), what is the value of \( x \)?

**Tip:** When substituting values into an expression, ensure all occurrences of the variable are replaced to avoid calculation errors.

Learn how to evaluate the expression 3x with x = 5. This problem involves substituting a value into an algebraic expression and calculating the result step-by-step. Suitable for students in Grades 6-8.

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