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F.O.I.L= First, Outside, Inside, Last.

Example: (2x+3)(4x+5)

First: 2x X 4x = 8x2

Outside: 2 X 5 = 10

Inside: 3 X 4x = 12x

Last: 3 X 5 = 15

________________

Final result: 8x2+12x+25

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