To find the factors:
Place the term containing x2 at the bottom left of the rectangle and the constant term at the top right corner.
Compute their product and list its factors.
Find the factors of the x2 term, which, when added together, result in the x term. Put them in empty cells.
Find the common factors of each row and each column in the rectangle.
The length times the width of the rectangle is the factorization of your equation.
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