Answer :

Given :





P = (√2, -1, 1)


To Find : Equation of plane


Formulae :


1)


Where


2) Equation of plane :


If is the vector normal to the plane, then equation of the plane is



As


and



But,







Therefore direction cosines of the normal vector of the plane are (l, m, n)


Hence direction ratios are (kl, km, kn)


Therefore the equation of normal vector is










Now, equation of the plane is



………eq(1)


But



4√2x + 4y + 4z = p


As point P (√2, -1, 1) lies on the plane by substituting it in above equation,


4√2(√2) + 4(-1) + 4(1) = p


8 – 4 + 4 = p


P = 8


From eq(1)



Dividing throughout by 4



This is the equation of required plane.


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