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Simplifying 3x + x(4x) + 36 = 0 Remove parenthesis around (4x) 3x + x * 4x + 36 = 0 Reorder the terms for easier multiplication: 3x + 4x * x + 36 = 0 Multiply x * x 3x + 4x2 + 36 = 0 Reorder the terms: 36 + 3x + 4x2 = 0 Solving 36 + 3x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 9 + 0.75x + x2 = 0 Move the constant term to the right: Add '-9' to each side of the equation. 9 + 0.75x + -9 + x2 = 0 + -9 Reorder the terms: 9 + -9 + 0.75x + x2 = 0 + -9 Combine like terms: 9 + -9 = 0 0 + 0.75x + x2 = 0 + -9 0.75x + x2 = 0 + -9 Combine like terms: 0 + -9 = -9 0.75x + x2 = -9 The x term is 0.75x. Take half its coefficient (0.375). Square it (0.140625) and add it to both sides. Add '0.140625' to each side of the equation. 0.75x + 0.140625 + x2 = -9 + 0.140625 Reorder the terms: 0.140625 + 0.75x + x2 = -9 + 0.140625 Combine like terms: -9 + 0.140625 = -8.859375 0.140625 + 0.75x + x2 = -8.859375 Factor a perfect square on the left side: (x + 0.375)(x + 0.375) = -8.859375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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