How do I simplify this algebraic expression with a brain fart?

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SUMMARY

The discussion focuses on simplifying the algebraic expression 2(2-x)² - x(2-x)² - (2/3)(2-x)³. The simplification process involves substituting (2-x) with A, leading to the expression 2A² - xA² - (2/3)A³. Ultimately, the expression simplifies to (1/3)(2-x)³, confirming the correct application of algebraic manipulation techniques.

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cotufa
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I can't seem to see how this simplifies, having an algebra brain fart

[tex]2(2-x)^2-x(2-x)^2- 2/3 (2-x)^3[/tex]

[tex](2-x)(2-x)^2- 2/3 (2-x)^3[/tex]

[tex]1/3(2-x)^3[/tex]
 
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Let's replace (2-x) with A.
Then we have 2A^2 - xA^2 - (2/3)A^3
Then we get (2-x) A^2 - (2/3)A^3
since A=2-x, this gives
(A^3) - (2/3)A^3 = (1/3)A^3 ===> now just replace A with 2-x

approx
 
Thank you
 

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