Three vectors ,x,y, and z satisfy x+y+z=0 . Calculate the value ofx. y+y.z+x.z if lxl =2 , lyl=3 and lzl=4
ilham rafie , 13 Years ago
Grade
Vectors> vectors 3...
2 AnswersAbhishek V
Last Activity: 13 Years ago
14.5
vikas askiitian expert
Last Activity: 13 Years ago
x + y + z = 0
squaring both sides
x2 + y2 + z2 + 2(x.y+y.z+z.x) = 0
x.y + y.z + z.x = (x2+y2+z2)/2 ..............1
now plugging values of x,y z we get
x.y + y.z + z.x = 29/2
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