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ICSE Class X Math 2018 Paper

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Question : 16 of 32
Marks: +1, -0
Using properties of proportion, solve for xx. Given that xx is positive:
  2x+4x2−12x−4x2−1=4\; \frac{2x+\sqrt{4x^2-1}}{2x-\sqrt{4x^2-1}} = 4
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