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Simplifying f(D) = A4 + -2A3 + 3A2 + 4A + 5I Multiply f * D fD = A4 + -2A3 + 3A2 + 4A + 5I Reorder the terms: fD = 4A + 3A2 + -2A3 + A4 + 5I Solving fD = 4A + 3A2 + -2A3 + A4 + 5I Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'D'. f = 4AD-1 + 3A2D-1 + -2A3D-1 + A4D-1 + 5D-1I Simplifying f = 4AD-1 + 3A2D-1 + -2A3D-1 + A4D-1 + 5D-1I
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