help me!

N

nguyenbahiep1

[TEX]A( a, 2a+1) \\ y = f'(x_0) .(x-x_0) + y_0 \\ 2a+1 = \frac{-4}{(x_0 -1)^2}.(a -x_0) + \frac{x_0 +3}{x_0 -1}\\ 2.a.x_0^2 - 4.(a+2).x_0 +6a +4 = 0\\ a.x_0^2 - 2(a+2).x_0 +3a +2 = 0\\ a = 0 \Rightarrow A ( 0, 1)\\ \Delta' = 0 \Rightarrow a =2. a = -1 \Rightarrow A(2, 5), A ( -1. -1)[/TEX]
 
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