Hi

(x-3)^2 - (x+3)^2 = [x^2-6x+9] - [x^2+6x-9] =  -12x  + 18



(x-2)(3x^2+2x-1) = x(3x^2+2x-1)-2(3x^2+2x-1)= 3x^3-4x^2-5x + 2 

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