<math>\begin{array}{l}\left({\color{RoyalBlue}x+y}\right)\left({\color{Red}x+y}\right)\left({\color{OliveGreen}x+y}\right)\\\quad={\color{RoyalBlue}x\color{Red}x\color{OliveGreen}x}+{\color{RoyalBlue}x\color{Red}x\color{OliveGreen}y}+{\color{RoyalBlue}x\color{Red}y\color{OliveGreen}x}+{\color{RoyalBlue}x\color{Red}y\color{OliveGreen}y}\\\quad\quad+{\color{RoyalBlue}y\color{Red}x\color{OliveGreen}x}+{\color{RoyalBlue}y\color{Red}x\color{OliveGreen}y}+{\color{RoyalBlue}y\color{Red}y\color{OliveGreen}x}+{\color{RoyalBlue}y\color{Red}y\color{OliveGreen}y}\\\quad=x^3+3x^2y+3xy^2+y^3\end{array}</math>

${\displaystyle {\begin{array}{l}\left({\color {RoyalBlue}x+y}\right)\left({\color {Red}x+y}\right)\left({\color {OliveGreen}x+y}\right)\\\quad ={\color {RoyalBlue}x\color {Red}x\color {OliveGreen}x}+{\color {RoyalBlue}x\color {Red}x\color {OliveGreen}y}+{\color {RoyalBlue}x\color {Red}y\color {OliveGreen}x}+{\color {RoyalBlue}x\color {Red}y\color {OliveGreen}y}\\\quad \quad +{\color {RoyalBlue}y\color {Red}x\color {OliveGreen}x}+{\color {RoyalBlue}y\color {Red}x\color {OliveGreen}y}+{\color {RoyalBlue}y\color {Red}y\color {OliveGreen}x}+{\color {RoyalBlue}y\color {Red}y\color {OliveGreen}y}\\\quad =x^{3}+3x^{2}y+3xy^{2}+y^{3}\end{array}}}$

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