B = (f1, f2; f3) is a basis for R2[r]. If (1 2 1) is the change of basis 1 1 2 matrix from Saae to B then which of the following is fi? a) 4 – r – 2r e) 1– r² b) 2 – r c) 2 – r? d) 3 – 1 – r²

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A: Matrix multiplication

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