Question 1051424
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Hi  
                (a-b)^4 =  a^4 - 4a^3b^1 + 6a^2^b2- 4ab^3  + b^4    
 (2x-x^2)^4 = -x(x-2)^4 = -x(x^4 - 8x^3 + 24x^2 - 32x + 16)
finish as directed