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  • Please solve RD Sharma class 12 chapter 28 The Plane exercise Fill in the blank question 13 maths textbook solution

Please solve RD Sharma class 12 chapter 28 The Plane exercise Fill in the blank question 13 maths textbook solution

Answers (1)

Answer:

 -9

Hint:

 Use direction ratios

Given:

 \frac{x+1}{\lambda }=\frac{y-1}{1}=\frac{z+2}{-4}

Solution:

Let the given line is

\frac{x+1}{\lambda }=\frac{y-1}{1}=\frac{z+2}{-4}

Direction ratios are λ,1,-4

And the given plane  2x+  2y - 8z = -5

Its direction ratios are  2,2,-4

And the given line and plane are perpendicular, then

λ(1) + 1(1) + (-4)(-8) = 0

2λ + 2 + 16=0

λ = -9

Posted by

Gurleen Kaur

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