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Simplifying f(2a) = x2 + 2x + -1 Remove parenthesis around (2a) f * 2a = x2 + 2x + -1 Reorder the terms for easier multiplication: 2f * a = x2 + 2x + -1 Multiply f * a 2af = x2 + 2x + -1 Reorder the terms: 2af = -1 + 2x + x2 Solving 2af = -1 + 2x + x2 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '2f'. a = -0.5f-1 + f-1x + 0.5f-1x2 Simplifying a = -0.5f-1 + f-1x + 0.5f-1x2
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