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Simplifying x2 + 18x + -112 = 0 Reorder the terms: -112 + 18x + x2 = 0 Solving -112 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '112' to each side of the equation. -112 + 18x + 112 + x2 = 0 + 112 Reorder the terms: -112 + 112 + 18x + x2 = 0 + 112 Combine like terms: -112 + 112 = 0 0 + 18x + x2 = 0 + 112 18x + x2 = 0 + 112 Combine like terms: 0 + 112 = 112 18x + x2 = 112 The x term is 18x. Take half its coefficient (9). Square it (81) and add it to both sides. Add '81' to each side of the equation. 18x + 81 + x2 = 112 + 81 Reorder the terms: 81 + 18x + x2 = 112 + 81 Combine like terms: 112 + 81 = 193 81 + 18x + x2 = 193 Factor a perfect square on the left side: (x + 9)(x + 9) = 193 Calculate the square root of the right side: 13.892443989 Break this problem into two subproblems by setting (x + 9) equal to 13.892443989 and -13.892443989.Subproblem 1
x + 9 = 13.892443989 Simplifying x + 9 = 13.892443989 Reorder the terms: 9 + x = 13.892443989 Solving 9 + x = 13.892443989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = 13.892443989 + -9 Combine like terms: 9 + -9 = 0 0 + x = 13.892443989 + -9 x = 13.892443989 + -9 Combine like terms: 13.892443989 + -9 = 4.892443989 x = 4.892443989 Simplifying x = 4.892443989Subproblem 2
x + 9 = -13.892443989 Simplifying x + 9 = -13.892443989 Reorder the terms: 9 + x = -13.892443989 Solving 9 + x = -13.892443989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + x = -13.892443989 + -9 Combine like terms: 9 + -9 = 0 0 + x = -13.892443989 + -9 x = -13.892443989 + -9 Combine like terms: -13.892443989 + -9 = -22.892443989 x = -22.892443989 Simplifying x = -22.892443989Solution
The solution to the problem is based on the solutions from the subproblems. x = {4.892443989, -22.892443989}
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