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Simplifying fx = (3x + 7)(3x + 7) Reorder the terms: fx = (7 + 3x)(3x + 7) Reorder the terms: fx = (7 + 3x)(7 + 3x) Multiply (7 + 3x) * (7 + 3x) fx = (7(7 + 3x) + 3x * (7 + 3x)) fx = ((7 * 7 + 3x * 7) + 3x * (7 + 3x)) fx = ((49 + 21x) + 3x * (7 + 3x)) fx = (49 + 21x + (7 * 3x + 3x * 3x)) fx = (49 + 21x + (21x + 9x2)) Combine like terms: 21x + 21x = 42x fx = (49 + 42x + 9x2) Solving fx = 49 + 42x + 9x2 Solving for variable 'f'. Move all terms containing f to the left, all other terms to the right. Divide each side by 'x'. f = 49x-1 + 42 + 9x Simplifying f = 49x-1 + 42 + 9x Reorder the terms: f = 42 + 49x-1 + 9x
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