ĐK: x≥−1hpt ⇒(x+1)y2+2y√x+1+1=13x+2+7√x+1−1 $\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}_1từpt2\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0(VNo)\Rightarrow $ HPT Vno
ĐK:
x≥−1hpt
⇒(x+1)y2+2y√x+1+1=13x+2+7√x+1−1 $\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}
+1
từpt2\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1
\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0
(VNo)\Rightarrow $ HPT Vno