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ok a is given in our scenario
F is made up of
x multiplied by itself.
is made up of factors of c multiplied by 1x and combined
L is factors of c multiplied together
meaning when you reverse FOIL that the first part of factors making up a polynomial of the type
is 1x and the last part of the factors comes from factors of c, which when combined with x make up the coefficient of b.
hence the factors are (x+2)(x+3)