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Multiplying a Binomial and a Trinomial (18x 3  +7x 2 +3x)+(6x 2  +3x)
Step 1:  make your grid
Step 2:  label your grid ,[object Object],3x
Step 3:  solve by cross multiplying ,[object Object],18x 3 +7x 2 3x 6x 2 +3x 6x 2 21x 2 54x 3 18x 2 42x 2 108x 2
Step 4:  use the numbers in the boxes in step three to combine like terms ,[object Object],[object Object]

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