Dễ thấy: [tex](-4,-3);(4,-3)[/tex] thỏa mãn [tex]x^2-25=y(y+3)[/tex] nên [tex](-4,-3);(4,-3)\notin A\Rightarrow[/tex] M = A \ B = [tex]\varnothing[/tex]
Dễ thấy: [tex](-4,-3);(4,-3)[/tex] thỏa mãn [tex]x^2-25=y(y+3)[/tex] nên [tex](-4,-3);(4,-3)\notin A\Rightarrow[/tex] M = A \ B = [tex]\varnothing[/tex]