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((x + 1) (x + 1)) (x + 1) = (x + 1) (x + 1) =
x(x + 1) + 1(x + 1)
x² + x + x + 1
x² + 2x + 1
(x² + 2x + 1) (x + 1) = x²(x + 1) + 2x(x + 1) + 1(x + 1)
= x³ + x² + 2x² + 2x + x + 1
= x³ + 3x² + 3x + 1