[tex]N = ( {x}^{2} + x)( {x}^{2} + x + 2) + 1[/tex]
[tex]Notam \: \: {x}^{2} + x \: \: cu \: a.[/tex]
[tex] {x}^{2} + x = a[/tex]
[tex] N = a(a + 2) + 1[/tex]
[tex]N = {a}^{2} + 2a + 1[/tex]
[tex]N = {(a + 1)}^{2} [/tex]
[tex] = > N = {( {x}^{2} + x + 1)}^{2} [/tex]
[tex]=>N=p.p[/tex]