dF=F(x+dx)-F(x)
1)dF=2(x+dx)^2+3(x+dx)-2x^2-3x=2(x^2+2xdx+d^2x)+3x+3dx-2x^2-3x=
=2x^2+4xdx+2d^2x+3x+3dx-2x^2-3x=4xdx+2d^2x+3dx
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dF=F(x+dx)-F(x)
1)dF=2(x+dx)^2+3(x+dx)-2x^2-3x=2(x^2+2xdx+d^2x)+3x+3dx-2x^2-3x=
=2x^2+4xdx+2d^2x+3x+3dx-2x^2-3x=4xdx+2d^2x+3dx