Răspuns :
Notam x²+3x-1=a. Expresia data se scrie :
[tex](a-2) \cdot a+1=a^2-2a+1=(a-1)^2=(x^2+3x-1-1)^2=\\ =(x^2+3x-2)^2[/tex]
[tex](a-2) \cdot a+1=a^2-2a+1=(a-1)^2=(x^2+3x-1-1)^2=\\ =(x^2+3x-2)^2[/tex]