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NDA 2025
Exam
NDA
Year
2025
Subject
Mathematics
Chapter
Three Dimensional Geometry

NDA 2025 · Mathematics · Three Dimensional Geometry

For the following two (02) items: A plane P is parallel to the line...

For the following two (02) items:
A plane PP is parallel to the line having direction ratios ⟨1,3,2⟩\langle 1, 3, 2 \rangle and contains the line of intersection of the planes 6x+4y−5z=26x + 4y - 5z = 2 and x−2y+3z=0x - 2y + 3z = 0.

What is the equation of the plane PP?

Options

  1. A2x−20y+29z+2=02x - 20y + 29z + 2 = 0
  2. B2x−20y+29z−2=02x - 20y + 29z - 2 = 0
  3. C2x+3y+2z−4=02x + 3y + 2z - 4 = 0
  4. Dx−3y+2z+5=0x - 3y + 2z + 5 = 0

Correct answer

A. 2x−20y+29z+2=02x - 20y + 29z + 2 = 0

Step-by-step solution

The equation of the plane passing through the line of intersection of the given planes is

(6x+4y−5z−2)+λ(x−2y+3z)=0(6x + 4y - 5z - 2) + \lambda(x - 2y + 3z) = 0

(6+λ)x+(4−2λ)y+(−5+3λ)z−2=0(6 + \lambda)x + (4 - 2\lambda)y + (-5 + 3\lambda)z - 2 = 0

Since this plane is parallel to the line with direction ratios ⟨1,3,2⟩\langle 1, 3, 2 \rangle, the normal to the plane is perpendicular to the line. Thus,

1(6+λ)+3(4−2λ)+2(−5+3λ)=01(6 + \lambda) + 3(4 - 2\lambda) + 2(-5 + 3\lambda) = 0

6+λ+12−6λ−10+6λ=06 + \lambda + 12 - 6\lambda - 10 + 6\lambda = 0

λ+8=0⇒λ=−8\lambda + 8 = 0 \Rightarrow \lambda = -8

Substituting λ=−8\lambda = -8 in the equation of the plane, we get

(6−8)x+(4−2(−8))y+(−5+3(−8))z−2=0(6 - 8)x + (4 - 2(-8))y + (-5 + 3(-8))z - 2 = 0

−2x+20y−29z−2=0-2x + 20y - 29z - 2 = 0

2x−20y+29z+2=02x - 20y + 29z + 2 = 0

Answer: 2x−20y+29z+2=02x - 20y + 29z + 2 = 0
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