(х+2)(х-2)(х^2+4)-(4+х^2)^2=(х^2-4)(х^2+4)-(16+8х^2+х^4)=х^4-16-16-8х^2-х^4=-8х^2-32= -8(х^2+4)
Если х=1/2=0,5, то -8(х^2+4)=-8(0,5^2+4) =-8(0,25+4) =-8*4,25=-34
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(х+2)(х-2)(х^2+4)-(4+х^2)^2=(х^2-4)(х^2+4)-(16+8х^2+х^4)=х^4-16-16-8х^2-х^4=-8х^2-32= -8(х^2+4)
Если х=1/2=0,5, то -8(х^2+4)=-8(0,5^2+4) =-8(0,25+4) =-8*4,25=-34