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a.(3x-2)^2+(2x+3)^2=9x²-12x+4+4x²+12x+9=13x²+13
b. (a-3)^2-(a+4)*(4-a)-6(3-a)=
=(a-3)^2+(a+4)*(a-4)-6(3-a)=
=a²-6a+9+a²-16-18+6a=2a²-25