Multiply 3x (2x − 1) by following these steps:

Step 1: Drag tiles to the section labeled Factor 1 to represent the factor 3x.

Step 2: Drag tiles to the section labeled Factor 2 to represent the factor 2x − 1.

Step 3: Complete the model by dragging tiles to create a rectangle in the section labeled Product that represents the product of these factors.

Step 4: What is the product of these two binomials?
 x2 − 3x
x + 3x
6x2 − 3x