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JEE Mains · Maths · STD 11 - 9. straight line

यदि रेखा \(\ell_1: 3 y-2 x=3\) रेखाओं \(\ell_2: x-y+1=0\) तथा \(\ell_3: \alpha x+\beta y+17=0\) की कोण समद्विभादक है, तो \(\alpha^2+\beta^2-\alpha-\beta\) बराबर है

  1. A \(348\)
  2. B \(346\)
  3. C \(347\)
  4. D \(345\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(348\)

Step-by-step Solution

Detailed explanation

Sol. Point of intersection of \(\ell_1: 3 y -2 x =3\) \(\ell_2: x - y +1=0 \text { is } P \equiv(0,1)\) Which lies on \(\ell_3: \alpha x +\beta y +17=0\), \(\Rightarrow \beta=-17\) Consider a random point \(Q \equiv(-1,0)\) on \(\ell_2: x - y +1=0\), image of \(Q\) about…
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