ĐK: $x\geq -1$hpt $\Rightarrow (x+1)y^{2}+2y\sqrt{x+1}+1=13x+2+7\sqrt{x+1}-1$ $\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}+1$từ pt 2 $\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1$ $\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0$ ( VNo)$\Rightarrow $ HPT Vno
ĐK: $x\geq -1$hpt $\Rightarrow (x+1)y^{2}+2y\sqrt{x+1}+1=13x+2+7\sqrt{x+1}-1$ $\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}_1$từ pt 2 $\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1$ $\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0$ ( VNo)$\Rightarrow $ HPT Vno
ĐK: $x\geq -1$hpt $\Rightarrow (x+1)y^{2}+2y\sqrt{x+1}+1=13x+2+7\sqrt{x+1}-1$ $\Leftrightarrow (y\sqrt{x+1}+1)^{2} =13x+7\sqrt{x+1}
+1$từ pt 2 $\Leftrightarrow (7\sqrt{x+1}-1)^{2}=13x+7\sqrt{x+1}+1$ $\Leftrightarrow 36(x+1)-21\sqrt{x+1}+13=0$ ( VNo)$\Rightarrow $ HPT Vno