Question

Найти x-y из системы
√3x - √3y = 3
√3x + √3y = 4

Answer 1

$sqrt{3x}-sqrt{3y}=3;sqrt{3x}+sqrt{3y}=4;\\(sqrt{3x}-sqrt{3y})*(sqrt{3x}+sqrt{3y})=3*4;\\(sqrt(3x))^2-(sqrt{3y})^2=12;\\3x-3y=12;\\x-y=4;$