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JEE Mains · Maths · STD 12 - 11. three dimension geometry

यदि समतल \(3 x-y+4 z=2\) में बिन्दु \((2,4,7)\) का दपर्ण प्रतिबिम्ब \(( a , b , c )\) है, तो \(2 a + b +2 c\) बराबर है:

  1. A \(5\)
  2. B \(4\)
  3. C \(-6\)
  4. D \(-4\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(-6\)

Step-by-step Solution

Detailed explanation

\(\frac{a-2}{3}=\frac{b-4}{-1}=\frac{c-7}{4}=\frac{-2(6-4+28-2)}{3^{2}+1^{2}+4^{2}}\) \(\Rightarrow a=\frac{-84}{13}+2, b=\frac{28}{13}+4, C=\frac{-112}{13}+7\) \(\Rightarrow 2 a+b+2 c=-6\)
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