Question

Решите срочно ! Дам Много баллов !!!$sqrt{2 x^{2} +8x+7} -x=2$

Answer 1

$sqrt{2 x^{2} +8x+7} -x=2\ sqrt{2x^2+8x+7}=x+2\ leftlbracebegin{array}{l} 2x^2+8x+7=(x+2)^2\ x+2geqslant0 end{array}right.\ leftlbracebegin{array}{l} x^2+4x+3=0\ x+2geqslant0 end{array}right.\ boxed{x=-1}$