Hi, bạn cũng ở HD ak!
Giai pt: 2x^2 – 11x + 23 = 4 √x+1 day la de thi hoc sinh gioi tinh hay sao ay???
8-XGiải:
[TEX]2x^2 - 11x + 23 = 4\sqrt{x+1}[/TEX]
\Leftrightarrow[TEX]2(x^2 - 6x +9) = 4\sqrt{x +1} - x - 5[/TEX]
\Leftrightarrow[TEX]2(x - 3)^2 = \frac{-(x-3)^2}{4\sqrt{x+1} + x +5}[/TEX]
\Leftrightarrow[TEX](x - 3)[2x - 6 + \frac{x -3}{4\sqrt{x+1} + x +5}] = 0[/TEX]
\Leftrightarrow x = 3.