To simplify the expression \( x(2x + 3) \), we need to distribute \( x \) to both terms inside the parentheses. This involves multiplying \( x \) by \( 2x \) and \( x \) by \( 3 \).
Step 1: Distribute \( x \) to Each Term Inside the Parentheses
To simplify the expression \( x(2x + 3) \), we distribute \( x \) to both terms inside the parentheses:
\[
x(2x + 3) = x \cdot 2x + x \cdot 3
\]
Step 2: Perform the Multiplication
Next, we perform the multiplication for each term:
\[
x \cdot 2x = 2x^2
\]
\[
x \cdot 3 = 3x
\]
Step 3: Combine the Results
Finally, we combine the results from the previous step:
\[
x(2x + 3) = 2x^2 + 3x
\]
Final Answer
The simplified expression is:
\[
\boxed{2x^2 + 3x}
\]