Question

tìm số nguyên x,y biết: (x+3) (y-5)= -15

help me

Answer 1

(x+3)(y-5)=-15

=>\(\left(x+3;y-5\right)\in\left\{\left(1;-15\right);\left(-15;1\right);\left(-1;15\right);\left(15;-1\right);\left(3;-5\right);\left(-5;3\right);\left(-3;5\right);\left(5;-3\right)\right\}\)

=>\(\left(x,y\right)\in\left\{\left(-2;-10\right);\left(-18;6\right);\left(-4;20\right);\left(12;4\right);\left(0;0\right);\left(-8;8\right);\left(-6;10\right);\left(2;2\right)\right\}\)