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Simplifying f(-1x) = x2 + 8x + 9 Remove parenthesis around (-1x) f * -1x = x2 + 8x + 9 Reorder the terms for easier multiplication: -1f * x = x2 + 8x + 9 Multiply f * x -1fx = x2 + 8x + 9 Reorder the terms: -1fx = 9 + 8x + x2 Solving -1fx = 9 + 8x + x2 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by '-1x'. f = -9x-1 + -8 + -1x Simplifying f = -9x-1 + -8 + -1x Reorder the terms: f = -8 + -9x-1 + -1x
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