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Simplifying 5d2 + -7d + -5 = 0 Reorder the terms: -5 + -7d + 5d2 = 0 Solving -5 + -7d + 5d2 = 0 Solving for variable 'd'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -1 + -1.4d + d2 = 0 Move the constant term to the right: Add '1' to each side of the equation. -1 + -1.4d + 1 + d2 = 0 + 1 Reorder the terms: -1 + 1 + -1.4d + d2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1.4d + d2 = 0 + 1 -1.4d + d2 = 0 + 1 Combine like terms: 0 + 1 = 1 -1.4d + d2 = 1 The d term is -1.4d. Take half its coefficient (-0.7). Square it (0.49) and add it to both sides. Add '0.49' to each side of the equation. -1.4d + 0.49 + d2 = 1 + 0.49 Reorder the terms: 0.49 + -1.4d + d2 = 1 + 0.49 Combine like terms: 1 + 0.49 = 1.49 0.49 + -1.4d + d2 = 1.49 Factor a perfect square on the left side: (d + -0.7)(d + -0.7) = 1.49 Calculate the square root of the right side: 1.220655562 Break this problem into two subproblems by setting (d + -0.7) equal to 1.220655562 and -1.220655562.Subproblem 1
d + -0.7 = 1.220655562 Simplifying d + -0.7 = 1.220655562 Reorder the terms: -0.7 + d = 1.220655562 Solving -0.7 + d = 1.220655562 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + d = 1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + d = 1.220655562 + 0.7 d = 1.220655562 + 0.7 Combine like terms: 1.220655562 + 0.7 = 1.920655562 d = 1.920655562 Simplifying d = 1.920655562Subproblem 2
d + -0.7 = -1.220655562 Simplifying d + -0.7 = -1.220655562 Reorder the terms: -0.7 + d = -1.220655562 Solving -0.7 + d = -1.220655562 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + d = -1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + d = -1.220655562 + 0.7 d = -1.220655562 + 0.7 Combine like terms: -1.220655562 + 0.7 = -0.520655562 d = -0.520655562 Simplifying d = -0.520655562Solution
The solution to the problem is based on the solutions from the subproblems. d = {1.920655562, -0.520655562}
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