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Simplifying 2x2 + 2x + -399 = 0 Reorder the terms: -399 + 2x + 2x2 = 0 Solving -399 + 2x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -199.5 + x + x2 = 0 Move the constant term to the right: Add '199.5' to each side of the equation. -199.5 + x + 199.5 + x2 = 0 + 199.5 Reorder the terms: -199.5 + 199.5 + x + x2 = 0 + 199.5 Combine like terms: -199.5 + 199.5 = 0.0 0.0 + x + x2 = 0 + 199.5 x + x2 = 0 + 199.5 Combine like terms: 0 + 199.5 = 199.5 x + x2 = 199.5 The x term is x. Take half its coefficient (0.5). Square it (0.25) and add it to both sides. Add '0.25' to each side of the equation. + 0.25 + x2 = 199.5 + 0.25 Combine like terms: + 0.25 = 1.25 1.25 + x2 = 199.5 + 0.25 Combine like terms: 199.5 + 0.25 = 199.75 1.25 + x2 = 199.75 Factor a perfect square on the left side: (x + 0.5)(x + 0.5) = 199.75 Calculate the square root of the right side: 14.133294025 Break this problem into two subproblems by setting (x + 0.5) equal to 14.133294025 and -14.133294025.Subproblem 1
x + 0.5 = 14.133294025 Simplifying x + 0.5 = 14.133294025 Reorder the terms: 0.5 + x = 14.133294025 Solving 0.5 + x = 14.133294025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 14.133294025 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 14.133294025 + -0.5 x = 14.133294025 + -0.5 Combine like terms: 14.133294025 + -0.5 = 13.633294025 x = 13.633294025 Simplifying x = 13.633294025Subproblem 2
x + 0.5 = -14.133294025 Simplifying x + 0.5 = -14.133294025 Reorder the terms: 0.5 + x = -14.133294025 Solving 0.5 + x = -14.133294025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -14.133294025 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -14.133294025 + -0.5 x = -14.133294025 + -0.5 Combine like terms: -14.133294025 + -0.5 = -14.633294025 x = -14.633294025 Simplifying x = -14.633294025Solution
The solution to the problem is based on the solutions from the subproblems. x = {13.633294025, -14.633294025}
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