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E

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6x^5 + 15x^4 + 20x^3 + 15x^2 + 6x + 1
= (6x^5 + 3x^4) + (12x^4 + 6x^3) + (14x^3 + 7x^2) + (8x^2 + 4x) + (2x + 1)
= 3x^4(2x + 1) + 6x^3(2x + 1) + 7x^2(2x + 1) + 4x(2x + 1) + (2x + 1)
= (3x^4 + 6x^3 + 7x^2 + 4x + 1)(2x + 1)
= [(3x^4 + 3x^3 + x^2) + (3x^3 + 3x^2 + x) + (3x^2 + 3x + 1)](2x + 1)
= [x^2(3x^2 + 3x + 1) + x(3x^2 + 3x + 1) + (3x^2 + 3x + 1)](2x + 1)
= (x^2 + x + 1)(3x^2 + 3x + 1)(2x + 1)
 
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