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Simplifying 20x2 + 30x + 11 = 0 Reorder the terms: 11 + 30x + 20x2 = 0 Solving 11 + 30x + 20x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 20 the coefficient of the squared term: Divide each side by '20'. 0.55 + 1.5x + x2 = 0 Move the constant term to the right: Add '-0.55' to each side of the equation. 0.55 + 1.5x + -0.55 + x2 = 0 + -0.55 Reorder the terms: 0.55 + -0.55 + 1.5x + x2 = 0 + -0.55 Combine like terms: 0.55 + -0.55 = 0.00 0.00 + 1.5x + x2 = 0 + -0.55 1.5x + x2 = 0 + -0.55 Combine like terms: 0 + -0.55 = -0.55 1.5x + x2 = -0.55 The x term is 1.5x. Take half its coefficient (0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. 1.5x + 0.5625 + x2 = -0.55 + 0.5625 Reorder the terms: 0.5625 + 1.5x + x2 = -0.55 + 0.5625 Combine like terms: -0.55 + 0.5625 = 0.0125 0.5625 + 1.5x + x2 = 0.0125 Factor a perfect square on the left side: (x + 0.75)(x + 0.75) = 0.0125 Calculate the square root of the right side: 0.111803399 Break this problem into two subproblems by setting (x + 0.75) equal to 0.111803399 and -0.111803399.Subproblem 1
x + 0.75 = 0.111803399 Simplifying x + 0.75 = 0.111803399 Reorder the terms: 0.75 + x = 0.111803399 Solving 0.75 + x = 0.111803399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 0.111803399 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 0.111803399 + -0.75 x = 0.111803399 + -0.75 Combine like terms: 0.111803399 + -0.75 = -0.638196601 x = -0.638196601 Simplifying x = -0.638196601Subproblem 2
x + 0.75 = -0.111803399 Simplifying x + 0.75 = -0.111803399 Reorder the terms: 0.75 + x = -0.111803399 Solving 0.75 + x = -0.111803399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -0.111803399 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -0.111803399 + -0.75 x = -0.111803399 + -0.75 Combine like terms: -0.111803399 + -0.75 = -0.861803399 x = -0.861803399 Simplifying x = -0.861803399Solution
The solution to the problem is based on the solutions from the subproblems. x = {-0.638196601, -0.861803399}
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