Question

Bài 3 câu B

Answer 1

   [ 1+(x+√x/√x+1)][1-(x-√x/√x-1)]=-2
<=>[1+(√x.(√x+1)/√x+1][1-(√x(√x-1)/√x-1)]=-2
<=>(1+√x)(1-√x)=-2
<=>1-√x^2=-2
<=>1-x=-2
<=>x=3