Question

Daca a∈N si a²-b²=0 cu b∈Z- atunci b=.....

Answer 1

   
[tex]\displaystyle \bf\\ a^2 -b^2 = 0\\\\ a^2 = b^2~~~\Big| \sqrt{~~} \\\\ \sqrt{a^2} = \sqrt{b^2}\\\\ a = \Big|b\Big|\\\\ b = \pm a \\\\ \boxed{b_1 = -a}\\ \boxed{b_2 = a} [/tex]