The FOIL method is a useful way to recall how to expand the product of two binomials (a + b) x (c + d). Multiply the First terms, Outer terms, Inner terms, and the Last terms of the binomials, and sum the four products to obtain the formula (a + b) x (c + d) = ac + ad + bc + bd. Explain how the rectangular area diagram shown to the right justifies the FOIL method. F d What is the area of F? The area of F isO

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