First slide
Planes in 3D
Question

 Find the distance of the point P(3,8,2) from the line 12(x1)=14(y3)=13(z2) measured 

 parallel to the plane 3x+2y2z+15=0

Difficult
Solution

 Let general point of line be A(2λ+1,4λ+3,3λ+2). Let this point lies at the same distance as 

 the point p (3,8,2) from the plane 3x+2y2z+15=0

 Therefore, 3.3+2.82.2+1517=3(2λ+1)+2(4λ+3)2(3λ+2)+1517

36=8λ+20λ=2 Therefore, A is (5,11,8)PA=(53)2+(118)2+(82)2=4+9+36=7

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