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TS EAMCET · Maths · Quadratic Equation

A student while solving a quadratic equation in \(x\), he copied its constant term incorrectly and got its roots as 5 and 9. Another student copied the constant term and coefficient of \(x^2\) of the same equation correctly as 12 and 4 respectively. If \(s, p\) and \(\Delta\) denote respectively the sum of the roots, the product of the roots and the discriminate of the correct equation, then \(\frac{\Delta}{3 p+s}=\)

  1. A 48
  2. B 45
  3. C 128
  4. D 16
Verified Solution

Answer & Solution

Correct Answer

(C) 128

Step-by-step Solution

Detailed explanation

Let the equation be \(a x^2+b x+c=0\) Sum of roots \(=-\frac{b}{a}\) and product of roots \(=\frac{c}{a}\) when constant term is copied wrongly we get roots as 5 and 9. \(\therefore \quad-\frac{b}{a}=5+9 \quad\) [sum will remain correct] \(\Rightarrow \quad-\frac{b}{a}=14\)…