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JEE Mains · Maths · STD 12 - 1. relation and function

જો  \(f(x)\) એ દ્રીઘાત સમીકરણ છે કે જેથી  \(f(1) + f (2)\, = 0\) , અને \(-1\) એ \(f(x)\, = 0\) નું એક બીજ હોય તો  \(f(x)\, = 0\) નું બીજું બીજ મેળવો.

  1. A \( - \frac{5}{8}\)
  2. B \( - \frac{8}{5}\)
  3. C \(  \frac{5}{8}\)
  4. D \( \frac{8}{5}\)
Verified Solution

Answer & Solution

Correct Answer

(D) \( \frac{8}{5}\)

Step-by-step Solution

Detailed explanation

If \(a\) and \(-1\) are the roots of the polynomial, then we get \(f\left( x \right) = {x^2} + \left( {1 - a} \right)x - a\) \(\therefore f\left( 1 \right) = 2 - 2a\) and \(f\left( 2 \right) = 6 - 3a\) As, \(f\left( 1 \right) + f\left( 2 \right) = 0\)…
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