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Simplifying x2 + 18x + 27 = 0 Reorder the terms: 27 + 18x + x2 = 0 Solving 27 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-27' to each side of the equation. 27 + 18x + -27 + x2 = 0 + -27 Reorder the terms: 27 + -27 + 18x + x2 = 0 + -27 Combine like terms: 27 + -27 = 0 0 + 18x + x2 = 0 + -27 18x + x2 = 0 + -27 Combine like terms: 0 + -27 = -27 18x + x2 = -27 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 = -27 + 81 Reorder the terms: 81 + 18x + x2 = -27 + 81 Combine like terms: -27 + 81 = 54 81 + 18x + x2 = 54 Factor a perfect square on the left side: (x + 9)(x + 9) = 54 Calculate the square root of the right side: 7.348469228 Break this problem into two subproblems by setting (x + 9) equal to 7.348469228 and -7.348469228.Subproblem 1
x + 9 = 7.348469228 Simplifying x + 9 = 7.348469228 Reorder the terms: 9 + x = 7.348469228 Solving 9 + x = 7.348469228 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 = 7.348469228 + -9 Combine like terms: 9 + -9 = 0 0 + x = 7.348469228 + -9 x = 7.348469228 + -9 Combine like terms: 7.348469228 + -9 = -1.651530772 x = -1.651530772 Simplifying x = -1.651530772Subproblem 2
x + 9 = -7.348469228 Simplifying x + 9 = -7.348469228 Reorder the terms: 9 + x = -7.348469228 Solving 9 + x = -7.348469228 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 = -7.348469228 + -9 Combine like terms: 9 + -9 = 0 0 + x = -7.348469228 + -9 x = -7.348469228 + -9 Combine like terms: -7.348469228 + -9 = -16.348469228 x = -16.348469228 Simplifying x = -16.348469228Solution
The solution to the problem is based on the solutions from the subproblems. x = {-1.651530772, -16.348469228}
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