Răspuns :
[tex]A=(x-1)(x+1)(x^{2} +1)+{(x^{2} +3)}^2\\A=(x^{2} -1)(x^{2} +1)+{(x^{2} +3)}^2\\A=x^{4} -1+x^{4} +6x^{2} +9\\A=2x^{4} +6x^{2} +8[/tex]
[tex]A=(x-1)(x+1)(x^{2} +1)+{(x^{2} +3)}^2\\A=(x^{2} -1)(x^{2} +1)+{(x^{2} +3)}^2\\A=x^{4} -1+x^{4} +6x^{2} +9\\A=2x^{4} +6x^{2} +8[/tex]