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JEE Mains · Maths · STD 11 - 4.2 Quadratic equations and inequations

સમીકરણ \(9 x^{2}-18|x|+5=0\) ના બીજોનો ગુણાકાર .......... થાય 

  1. A \(\frac{25}{9}\)
  2. B \(\frac{25}{81}\)
  3. C \(\frac{5}{27}\)
  4. D \(\frac{5}{9}\)
Verified Solution

Answer & Solution

Correct Answer

(B) \(\frac{25}{81}\)

Step-by-step Solution

Detailed explanation

\(9 x^{2}-18|x|+5=0\) \(9|x|^{2}-15|x|-3|x|+5=0\left(\because x^{2}=|x|^{2}\right)\) \(3|x|(3|x|-5)-(3|x|-5)=0\) \(|x|=\frac{1}{3}, \frac{5}{3}\) \(x=\pm \frac{1}{3}, \pm \frac{5}{3}\) Product of roots \(=\frac{25}{81}\)
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