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Simplifying x2 + 2x + -85 = 0 Reorder the terms: -85 + 2x + x2 = 0 Solving -85 + 2x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '85' to each side of the equation. -85 + 2x + 85 + x2 = 0 + 85 Reorder the terms: -85 + 85 + 2x + x2 = 0 + 85 Combine like terms: -85 + 85 = 0 0 + 2x + x2 = 0 + 85 2x + x2 = 0 + 85 Combine like terms: 0 + 85 = 85 2x + x2 = 85 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = 85 + 1 Reorder the terms: 1 + 2x + x2 = 85 + 1 Combine like terms: 85 + 1 = 86 1 + 2x + x2 = 86 Factor a perfect square on the left side: (x + 1)(x + 1) = 86 Calculate the square root of the right side: 9.273618495 Break this problem into two subproblems by setting (x + 1) equal to 9.273618495 and -9.273618495.Subproblem 1
x + 1 = 9.273618495 Simplifying x + 1 = 9.273618495 Reorder the terms: 1 + x = 9.273618495 Solving 1 + x = 9.273618495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 9.273618495 + -1 Combine like terms: 1 + -1 = 0 0 + x = 9.273618495 + -1 x = 9.273618495 + -1 Combine like terms: 9.273618495 + -1 = 8.273618495 x = 8.273618495 Simplifying x = 8.273618495Subproblem 2
x + 1 = -9.273618495 Simplifying x + 1 = -9.273618495 Reorder the terms: 1 + x = -9.273618495 Solving 1 + x = -9.273618495 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -9.273618495 + -1 Combine like terms: 1 + -1 = 0 0 + x = -9.273618495 + -1 x = -9.273618495 + -1 Combine like terms: -9.273618495 + -1 = -10.273618495 x = -10.273618495 Simplifying x = -10.273618495Solution
The solution to the problem is based on the solutions from the subproblems. x = {8.273618495, -10.273618495}
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