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Let f(x) = (1 + 2x)(1 + 2x + 4x^2 + 8x^3...

Let `f(x) = (1 + 2x)(1 + 2x + 4x^2 + 8x^3 + ... oo).` If `A` is a matrix for which `A^3 = 0,` then `f(A)` equals (`I` is identity matrix of order equivalent to order of `A`).

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