FOILing (x + 3)2 = (x + 3)(x + 3)
    F Take the product of the First terms x.x = x2
    O Take the product of the Outer terms x.3 = 3x
    I Take the product of the Inner terms 3.x = 3x
    L Take the product of the Last terms 3.3 = 9
    Then add them all up x2 + 3x + 3x + 9   =   x2 + 6x + 9

Enter this as   x^2 - 6*x + 9

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