Question

[Duy Phan]

Tìm x,y nguyên thoả mãn 

a) x^2 +6x+6=y^2

b) 3x^2 +5y^2=345

Answer 1

[Quỳnh Trang Nguyễn]

x=-1;y=1

x=-1;y=-1

x=-5;y=-1

x=-5;y=1

Answer 2

[ngonhuminh]

a)(x+3)^2-3=y^2

(x+3-y)(x+3+y)=3

y=+-1

x={-5, -1}