Answer to Question #96506 in Analytic Geometry for Olajide Olaitan

Question #96506
Determine the value a so that A=2i+aj+k and B=4i-2j-2k are perpendicular
1
Expert's answer
2019-10-17T12:56:34-0400

We need to find the value of "a", when two vectors are perpendicular.

We know a formula


If Two Line are represented bye vectors A\vec {A} = a1i+a2j+a3ka_1 \vec {i} + a_2 \vec {j} + a_3 \vec {k}


B=b1i+b2j+b3k\vec {B} = b_1 \vec {i} + b_2 \vec {j} + b_3 \vec {k} are perpendicular

Then A.B=0\vec {A} . \vec {B} = 0


It means a1b1+a2b2+a3b3=0a_1 b_1 + a_2 b_2 + a_3 b_3 = 0


The given lines are A=2i+aj+1k\vec {A} = 2 \vec {i} + a \vec {j} + 1 \vec {k} and B=4i2j2k\vec {B} = 4 \vec {i} - 2 \vec {j} - 2 \vec {k} are perpendicular.


So, 2(4) +a (-2) +1 (-2) = 0


2a = 6

a= 3.


Answer: a = 3



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