giai phương trinh

N

nguyenbahiep1

giai phương trinh sau...............
3x^2-11x-2=0

[laTEX]3(x-\frac{11}{6})^2 - \frac{145}{12} = 0 \\ \\ (x-\frac{11}{6})^2 = \frac{145}{36} \\ \\ TH_1: x -\frac{11}{6} = \frac{\sqrt{145}}{6} \\ \\ TH_2: x -\frac{11}{6} = -\frac{\sqrt{145}}{6} \\ \\ \Rightarrow x = \frac{ 11 \pm \sqrt{145}}{6}[/laTEX]
 
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