Răspuns: ±[tex]\frac{\sqrt{202}}{8}[/tex]
Explicație pas cu pas: |x^2 +6x+9|=|x^2 +10x-11| <=> (x^2 +6x+9)^2 =(x^2 +10x-11)^2
x^4 +36x^2 +81 = x^4 +100x^2 -121
36x^2 -100x^2 = -121-81
-64x^2 = -202
x^2 = 202/64
x= ±[tex]\sqrt{\frac{202}{64}}[/tex]= ±[tex]\frac{\sqrt{202}}{8}[/tex]
