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Which of the following has two equal roots?A) $ \quad x^{2}-2 x-1=0 \quad $ B) $ x^{2}-2 x+1=0 $ B) $ 2 x^{2}-2 x+1=0 \quad $ D) $ x^{2}-2 x-3=0 $ |
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Answer» B is an identity which says (x-1)^2=x^2-2x+1. |
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