A perpendicular is drawn from the point A(1,8,4) to the line joining the points B(0,−1,3) and C(2,−3,−1). The co-ordinates of the foot of the perpendicular is:
A
(53,23,193)
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B
(53,23,−193)
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C
(53,−23,193)
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D
(−53,23,193)
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Solution
The correct option is D(−53,23,193) Equation of line BC is : x2=y+1−2=z−3−4
Any point D on the line can be taken as: (2t,−2t−1,−4t+3)
Now, −−→DA=(1−2t,9+2t,1+4t)
For foot of perpendicular, −−→DA.(2i−2j−4k)=0 ⇒2−4t−18−4t−4−16t=0 ⇒t=−56
Hence, we have D=(−53,23,193)