2√a-(a+√a)/(a-√a)=2√a-√a(√a+1)/√a(√a-1)=2√a-(√a+1)^2/(√a-1)(√a+1)=2√a-(a+2√a+1)/(a-1)=2√2-(2+2√2+1)=2√2-3-2√2=-3
