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Explain solution RD Sharma class 12 chapter 28 The Plane exercise Fill in the blank question 12 maths

Answers (1)

Answer:

 -6

Hint:

 Use direction ratios

Given:

 \frac{x-2}{3}=\frac{y-1}{-5}=\frac{z+2}{2}

Solution:

The line is

\frac{x-2}{3}=\frac{y-1}{-5}=\frac{z+2}{2}

The direction radius of the line are(3,-5,2)

As the line lies in the plane x + 3y - αz + 7 = 0

We have   3-15-2\alpha+7=0\Rightarrow -2\alpha-5=0

\\ \\ \alpha=-\frac{5}{2}

 

 

Posted by

Gurleen Kaur

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