If the line,  lies in the plane,then   is equal to: Option 1) 26 Option 2) 18 Option 3) 5 Option 4) 2

As we learnt in

Plane passing through a point and a line (vector form) -

Let the plane passes through and a line then the plane is given by

- wherein

line

lies in plane lx+my-z=9

So (3,-2,-4) statisfies lx+my-z=9

3l-2m+4=9

3l-2m=5                ----------(i)

and

2l-m=3            -------------(ii)

l=1, m=-1

Option 1)

26

This option is incorrect

Option 2)

18

This option is incorrect

Option 3)

5

This option is incorrect

Option 4)

2

This option is correct