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Simplifying (5d2) + -1(9d) + -7 = 0 Remove parenthesis around (9d) (5d2) + -1 * 9d + -7 = 0 Multiply -1 * 9 (5d2) + -9d + -7 = 0 Reorder the terms: -7 + -9d + (5d2) = 0 Solving -7 + -9d + (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'. -1.4 + -1.8d + d2 = 0 Move the constant term to the right: Add '1.4' to each side of the equation. -1.4 + -1.8d + 1.4 + d2 = 0 + 1.4 Reorder the terms: -1.4 + 1.4 + -1.8d + d2 = 0 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + -1.8d + d2 = 0 + 1.4 -1.8d + d2 = 0 + 1.4 Combine like terms: 0 + 1.4 = 1.4 -1.8d + d2 = 1.4 The d term is -1.8d. Take half its coefficient (-0.9). Square it (0.81) and add it to both sides. Add '0.81' to each side of the equation. -1.8d + 0.81 + d2 = 1.4 + 0.81 Reorder the terms: 0.81 + -1.8d + d2 = 1.4 + 0.81 Combine like terms: 1.4 + 0.81 = 2.21 0.81 + -1.8d + d2 = 2.21 Factor a perfect square on the left side: ((d) + -0.9)((d) + -0.9) = 2.21 Calculate the square root of the right side: 1.486606875 Break this problem into two subproblems by setting ((d) + -0.9) equal to 1.486606875 and -1.486606875.Subproblem 1
(d) + -0.9 = 1.486606875 Simplifying (d) + -0.9 = 1.486606875 d + -0.9 = 1.486606875 Reorder the terms: -0.9 + d = 1.486606875 Solving -0.9 + d = 1.486606875 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + d = 1.486606875 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + d = 1.486606875 + 0.9 d = 1.486606875 + 0.9 Combine like terms: 1.486606875 + 0.9 = 2.386606875 d = 2.386606875 Simplifying d = 2.386606875Subproblem 2
(d) + -0.9 = -1.486606875 Simplifying (d) + -0.9 = -1.486606875 d + -0.9 = -1.486606875 Reorder the terms: -0.9 + d = -1.486606875 Solving -0.9 + d = -1.486606875 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + d = -1.486606875 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + d = -1.486606875 + 0.9 d = -1.486606875 + 0.9 Combine like terms: -1.486606875 + 0.9 = -0.586606875 d = -0.586606875 Simplifying d = -0.586606875Solution
The solution to the problem is based on the solutions from the subproblems. d = {2.386606875, -0.586606875}
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