Question

А A
À = 2 i + 2j + Mk and B= 2i- j+k 9 tk.
For which value of 'm Ä and B will be perpendicular to each orther
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Answer 1

a=2i+2j+mk

b=2i-j+k

If two vectors are perpendicular, the dot product of the vectors is zero.

a.b=0

(2i+2j+mk).(2i-j+k)=0

4-2+m=0

m= -2