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(2x + 1)(2x + 1)(2x + 1)
{ 2x(2x) + 2x(1) + 1(2x) + 1(1) } ()
{ 4x² + 2x + 2x + 1}(2x + 1)
{ 4x² + 4x + 1}(2x + 1)
4x²(2x) + 4x²(1) + 4x(2x) + 4x(1) + 1(2x) + 1(1)
8x³ + 4x² + 8x² + 4x + 2x + 1
8x³ + 12x² + 6x + 1