1)[tex](x-6)^2=25\\
x-6=\pm\sqrt{25}\\
x-6=\pm5\\
x_1=5+6=11\\
x_2=-5+6=1\\
A=\{1;11\}[/tex]
2)Ne gandim ce numar intreg la patrat este 25. Sunt 2 numere cu aceasta proprietate:
[tex]5^2=25\ si\ (-5)^2=25\\
(x-6)^2=5^2=>x-6=5=>x=11\\
(x-6)^2=(-5)^2=>x-6=-5=>x=1\\
A=\{1;11\}[/tex]
