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Simplifying x = x2 + 11x + 18 Reorder the terms: x = 18 + 11x + x2 Solving x = 18 + 11x + x2 Solving for variable 'x'. Reorder the terms: -18 + x + -11x + -1x2 = 18 + 11x + x2 + -18 + -11x + -1x2 Combine like terms: x + -11x = -10x -18 + -10x + -1x2 = 18 + 11x + x2 + -18 + -11x + -1x2 Reorder the terms: -18 + -10x + -1x2 = 18 + -18 + 11x + -11x + x2 + -1x2 Combine like terms: 18 + -18 = 0 -18 + -10x + -1x2 = 0 + 11x + -11x + x2 + -1x2 -18 + -10x + -1x2 = 11x + -11x + x2 + -1x2 Combine like terms: 11x + -11x = 0 -18 + -10x + -1x2 = 0 + x2 + -1x2 -18 + -10x + -1x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -18 + -10x + -1x2 = 0 Factor out the Greatest Common Factor (GCF), '-1'. -1(18 + 10x + x2) = 0 Ignore the factor -1.Subproblem 1
Set the factor '(18 + 10x + x2)' equal to zero and attempt to solve: Simplifying 18 + 10x + x2 = 0 Solving 18 + 10x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-18' to each side of the equation. 18 + 10x + -18 + x2 = 0 + -18 Reorder the terms: 18 + -18 + 10x + x2 = 0 + -18 Combine like terms: 18 + -18 = 0 0 + 10x + x2 = 0 + -18 10x + x2 = 0 + -18 Combine like terms: 0 + -18 = -18 10x + x2 = -18 The x term is 10x. Take half its coefficient (5). Square it (25) and add it to both sides. Add '25' to each side of the equation. 10x + 25 + x2 = -18 + 25 Reorder the terms: 25 + 10x + x2 = -18 + 25 Combine like terms: -18 + 25 = 7 25 + 10x + x2 = 7 Factor a perfect square on the left side: (x + 5)(x + 5) = 7 Calculate the square root of the right side: 2.645751311 Break this problem into two subproblems by setting (x + 5) equal to 2.645751311 and -2.645751311.Subproblem 1
x + 5 = 2.645751311 Simplifying x + 5 = 2.645751311 Reorder the terms: 5 + x = 2.645751311 Solving 5 + x = 2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 2.645751311 + -5 Combine like terms: 5 + -5 = 0 0 + x = 2.645751311 + -5 x = 2.645751311 + -5 Combine like terms: 2.645751311 + -5 = -2.354248689 x = -2.354248689 Simplifying x = -2.354248689Subproblem 2
x + 5 = -2.645751311 Simplifying x + 5 = -2.645751311 Reorder the terms: 5 + x = -2.645751311 Solving 5 + x = -2.645751311 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -2.645751311 + -5 Combine like terms: 5 + -5 = 0 0 + x = -2.645751311 + -5 x = -2.645751311 + -5 Combine like terms: -2.645751311 + -5 = -7.645751311 x = -7.645751311 Simplifying x = -7.645751311Solution
The solution to the problem is based on the solutions from the subproblems. x = {-2.354248689, -7.645751311}Solution
x = {-2.354248689, -7.645751311}
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