a)
2x(2-3)-3(3x+4)*(2x - 1)=4x-6x-(9x+12)(2x-1)=-2x-(18x^2-9x+24x-12)=-2x-(18x^2+15x-12)=-2x-18x^2-15x+12=-18x^2-17x+12
b)
5(2-b)^2-4b(-7+3)=5(2^2-2*2*b+b^2)-4b*(-4)=5(4-4b+b^2)+16b=20-20b+5b^2+16b=5b^2-4b+20
c)
1(x-1)^2 -x (x-1)=x^2-2x+1-x^2+x=-x+1
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d)b(4b +1)-3b(b^2+2b-7)=
e)(x-3)^2+3(3x+2)^2=
f)(a-3\sqrt{2}) (a+3\sqrt{2})-(a-1)^2=
g)(x-2)(x+2)+(x-2)^2=
h)(x+5)(x+2)+(x-4)(x+1)+3x=
i)(b-4)(c+4)-b(c+5)+7b=
j)4a(a-b)-(4a-3b)^2+9=