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Question: if you only hand out the answer and dont explain...

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If you only hand out the answer and don't explain . I will report as trash

(1). Please tell me how to form this to be a matrix form (x1,x1+x2, x1+x2+x3) why is not this matrix?

1 1 1
0 1 1
0 0 1

(2) please turn this basis to be the matrix form [1,x,x^2] why this one is correct i am so confused

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