Question

GPT \(\left(\sqrt{x+1}-1\right)\left(\sqrt{1-x}+1\right)=2x\)

Answer 1

=> x + 1 - 1 = 2x

=> x = 2x 

=> x - 2x = 0 

=> -x = 0 

=> x = 0

Answer 2

\(ab+a-b-1=a^2-b^2\Leftrightarrow2a^2-2ab-2b^2-2a+2+2b=0\)

\(màa^2+b^2=2=>4a^2-4a+1-\left(a+b\right)^2+2\left(a+2\right)-1=0\)

=>.......................8