InterviewSolution
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InterviewSolution
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The discriminant of \(\sqrt{x^2-5x-1}\) = 2 is A) 21 B) 23 C) 27 D) 45 |
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Answer» Correct option is (D) 45 We have \(\sqrt{x^2-5x-1}=2\) \(\Rightarrow x^2-5x-1=2^2=4\) (By squaring both sides) \(\Rightarrow x^2-5x-1-4=0\) \(\Rightarrow x^2-5x-5=0\) Discriminant \(=b^2-4ac\) \(=(-5)^2-4\times1\times-5\) = 25+20 = 45 Correct option is D) 45 |
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