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Simplifying 2d2 + -6d + -9 = 0 Reorder the terms: -9 + -6d + 2d2 = 0 Solving -9 + -6d + 2d2 = 0 Solving for variable 'd'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. -4.5 + -3d + d2 = 0 Move the constant term to the right: Add '4.5' to each side of the equation. -4.5 + -3d + 4.5 + d2 = 0 + 4.5 Reorder the terms: -4.5 + 4.5 + -3d + d2 = 0 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + -3d + d2 = 0 + 4.5 -3d + d2 = 0 + 4.5 Combine like terms: 0 + 4.5 = 4.5 -3d + d2 = 4.5 The d term is -3d. Take half its coefficient (-1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. -3d + 2.25 + d2 = 4.5 + 2.25 Reorder the terms: 2.25 + -3d + d2 = 4.5 + 2.25 Combine like terms: 4.5 + 2.25 = 6.75 2.25 + -3d + d2 = 6.75 Factor a perfect square on the left side: (d + -1.5)(d + -1.5) = 6.75 Calculate the square root of the right side: 2.598076211 Break this problem into two subproblems by setting (d + -1.5) equal to 2.598076211 and -2.598076211.Subproblem 1
d + -1.5 = 2.598076211 Simplifying d + -1.5 = 2.598076211 Reorder the terms: -1.5 + d = 2.598076211 Solving -1.5 + d = 2.598076211 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + d = 2.598076211 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + d = 2.598076211 + 1.5 d = 2.598076211 + 1.5 Combine like terms: 2.598076211 + 1.5 = 4.098076211 d = 4.098076211 Simplifying d = 4.098076211Subproblem 2
d + -1.5 = -2.598076211 Simplifying d + -1.5 = -2.598076211 Reorder the terms: -1.5 + d = -2.598076211 Solving -1.5 + d = -2.598076211 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + d = -2.598076211 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + d = -2.598076211 + 1.5 d = -2.598076211 + 1.5 Combine like terms: -2.598076211 + 1.5 = -1.098076211 d = -1.098076211 Simplifying d = -1.098076211Solution
The solution to the problem is based on the solutions from the subproblems. d = {4.098076211, -1.098076211}
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