Question

If b={(1,1,1),(1,1,−1),(1,−1,−1)}b={(1,1,1),(1,1,−1),(1,−1,−1)} is an ordered bass for R3R3. Let B∗={f1,f2,f3}B∗={f1,f2,f3} be the corresponding ordered dual basis for BB then (f1+f2+f3)(x1,x2,x3)=
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Answer 1

Answer:

this chapter is not clear

Step-by-step explanation:

please tell me the use eried's division