Question

if a = i + j - k, b = -i + 2j + 2k and c = -i + 2j -k, then a unit vector normal to the vectors a+b and b-c is

Answer 1

Answer:

a=i+j-k, b=-i+2j+2k

a+b=3j-k

b-c=-2i+3k

unit normal vector=(a+b)x(b-c)/|(a+b)x(b-c)|