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"Geometry has two great treasures; one is the Theorem of Pythagoras; the other, the division of a line into extreme and mean ratio. The first we may compare to a measure of gold; the second we may name a precious jewel."
Johannes Kepler
F.O.I.L. Method
A method used for multiplying binomials in which the first terms, the outside terms, the inside terms, and then the last terms are multiplied.