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9-40.

Multiple Choice: Which of the following expressions is the product of ?

Use a generic rectangle to multiply the expression together. Draw a rectangle and divide it into four equal parts.

Multiply each row by each column. Add the products together to get the final product. Added to the rectangle: Exterior left edge top is negative 3, X. Exterior left edge bottom is 4, y. Exterior bottom edge left is 2, y. Exterior bottom edge right is x.

 Added to the rectangle: Interior upper left box is negative 6, x, y. Interior upper right box is negative 3, X squared. Interior lower left box is negative 8, y squared. Interior lower right box is 4, X, Y.