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

જો સમીકરણ \(\mathrm{a}(\mathrm{b}-\mathrm{c}) \mathrm{x}^2+\mathrm{b}(\mathrm{c}-\mathrm{a}) \mathrm{x}+\mathrm{c}(\mathrm{a}-\mathrm{b})=0\) ના બીજ સમાન હોય, જ્યાં \(\mathrm{a}+\mathrm{c}=15\) અને \(\mathrm{b}=\frac{36}{5}\) હોય, તો \(a^2+c^2\) = __________

  1. A 115
  2. B 117
  3. C 119
  4. D 121
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Answer & Solution

Correct Answer

(B) 117

Step-by-step Solution

Detailed explanation

\begin{aligned} & a(b-c) x^2+b(c-a) x+c(a-b)=0 \\ & x=1 \text { is root } \therefore \text { other root is } 1 \\ & \alpha+\beta=-\frac{b(c-a)}{a(b-c)}=2 \\ & \Rightarrow-\mathrm{bc}+\mathrm{ab}=2 \mathrm{ab}-2 \mathrm{ac} \\ & \Rightarrow 2 \mathrm{ac}=\mathrm{ab}+\mathrm{bc}…

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