Question

find the direction ratios of the vector perpendicular to the two lines whose direction ratios are a= i^+3j^+2k and b=i^+j^+2k​

Answer 1

Answer:

for dot product

a.b

a=i^+3j^+2k^

b=i^+j^+2k^

so, then

a.b= ( i^+3j^+2k^).(i^+j^+2k^)

(i. i=1,j. j=1,k. k=1 in dot product)

you will get

a.b =1+3+4

a.b = 8

this is the answer for dot product