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

ધારો કે a અને β એ સમીકરણ \( x^{2}+2ax+(3a+10) = 0 \) ના બીજ છે, એવા કે જેથી \( \alpha<1<\beta \). તો a ના તમામ શક્ય મૂલ્યોનો ગણ ........... છે.

  1. A \( (-\infty,\frac{-11}{5})\cup(5,\infty) \)
  2. B \( (-\infty,-2)\cup(5,\infty) \)
  3. C \( (-\infty,-3) \)
  4. D \( (-\infty,\frac{-11}{5}) \)
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Answer & Solution

Correct Answer

(D) \( (-\infty,\frac{-11}{5}) \)

Step-by-step Solution

Detailed explanation

\(\because \alpha<1<\beta\) \( f(1)<0 \) \( \Rightarrow1+2a+(3a+10)<0 \) \( \Rightarrow5a+11<0 \) \( a<\frac{-11}{5} \) \(\therefore a \in\left(-\infty, \frac{-11}{5}\right)\)
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