Question 317065
a=(1,-1,3)
b=(-1,2,1)
a.b={{{1(-1)+(-1)(2)+3(1)=-1-2+3=0}}}
Since the dot product is zero, the vectors are perpendicular to each other.
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Add the vectors component by component.
a+b=(1,-1,3)+(-1,2,1)=(1-1,-1+2,3+1)=(0,1,4)