(x-4) ^{2}-2*(x+1)*(x+4)= x^{2}-8x+16-2*( x^{2}+5x+4)=
x^{2}-8x+16-2 x^{2}-10x-8=- x^{2}-18x+8
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(x-4) ^{2}-2*(x+1)*(x+4)= x^{2}-8x+16-2*( x^{2}+5x+4)=
x^{2}-8x+16-2 x^{2}-10x-8=- x^{2}-18x+8